diff --git a/src/www/firewall_aliases.php b/src/www/firewall_aliases.php
index 47f3f96bf..1309e3d15 100644
--- a/src/www/firewall_aliases.php
+++ b/src/www/firewall_aliases.php
@@ -32,46 +32,46 @@ require_once("guiconfig.inc");
 require_once("filter.inc");
 
 function find_alias_reference($section, $field, $origname, &$is_alias_referenced, &$referenced_by) {
-	global $config;
-	if(!$origname || $is_alias_referenced)
-		return;
+		global $config;
+		if(!$origname || $is_alias_referenced)
+				return;
 
-	$sectionref = &$config;
-	foreach($section as $sectionname) {
-		if(is_array($sectionref) && isset($sectionref[$sectionname]))
-			$sectionref = &$sectionref[$sectionname];
-		else
-			return;
-	}
+		$sectionref = &$config;
+		foreach($section as $sectionname) {
+				if(is_array($sectionref) && isset($sectionref[$sectionname]))
+					$sectionref = &$sectionref[$sectionname];
+				else
+					return;
+		}
 
-	if(is_array($sectionref)) {
-		foreach($sectionref as $itemkey => $item) {
-			$fieldfound = true;
-			$fieldref = &$sectionref[$itemkey];
-			foreach($field as $fieldname) {
-				if(is_array($fieldref) && isset($fieldref[$fieldname]))
-					$fieldref = &$fieldref[$fieldname];
-				else {
-					$fieldfound = false;
-					break;
+		if(is_array($sectionref)) {
+			foreach($sectionref as $itemkey => $item) {
+				$fieldfound = true;
+				$fieldref = &$sectionref[$itemkey];
+				foreach($field as $fieldname) {
+						if(is_array($fieldref) && isset($fieldref[$fieldname]))
+								$fieldref = &$fieldref[$fieldname];
+						else {
+								$fieldfound = false;
+								break;
+						}
+				}
+				if($fieldfound && $fieldref == $origname) {
+						$is_alias_referenced = true;
+						if(is_array($item))
+								$referenced_by = $item['descr'];
+						break;
 				}
 			}
-			if($fieldfound && $fieldref == $origname) {
-				$is_alias_referenced = true;
-				if(is_array($item))
-					$referenced_by = $item['descr'];
-				break;
-			}
 		}
-	}
 }
 
 
 if (!isset($config['aliases'])) {
-        $config['aliases'] = array();
+		$config['aliases'] = array();
 }
 if (!isset($config['aliases']['alias'])) {
-	$config['aliases']['alias'] = array();
+		$config['aliases']['alias'] = array();
 }
 $a_aliases = &$config['aliases']['alias'];
 
@@ -79,60 +79,60 @@ $a_aliases = &$config['aliases']['alias'];
 $selected_tab = htmlspecialchars(($_REQUEST['tab'] == "" ? "ip" : preg_replace("/\W/","",$_REQUEST['tab'])));
 
 if ($_SERVER['REQUEST_METHOD'] === 'POST') {
-  if (isset($_POST['apply'])) {
-		/* reload all components that use aliases */
-		filter_configure();
-		$savemsg = get_std_save_message();
-		clear_subsystem_dirty('aliases');
-	} elseif (isset($_POST['act']) && $_POST['act'] == "del") {
-    if (isset($_POST['id']) && isset($a_aliases[$_POST['id']])) {
-      // perform validation
-      /* make sure rule is not being referenced by any nat or filter rules */
-		$is_alias_referenced = false;
-		$referenced_by = false;
-		$alias_name = $a_aliases[$_POST['id']]['name'];
-		// Firewall rules
-		find_alias_reference(array('filter', 'rule'), array('source', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('filter', 'rule'), array('destination', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('filter', 'rule'), array('source', 'port'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('filter', 'rule'), array('destination', 'port'), $alias_name, $is_alias_referenced, $referenced_by);
-		// NAT Rules
-		find_alias_reference(array('nat', 'rule'), array('source', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('nat', 'rule'), array('source', 'port'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('nat', 'rule'), array('destination', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('nat', 'rule'), array('destination', 'port'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('nat', 'rule'), array('target'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('nat', 'rule'), array('local-port'), $alias_name, $is_alias_referenced, $referenced_by);
-		// NAT 1:1 Rules
-		//find_alias_reference(array('nat', 'onetoone'), array('external'), $alias_name, $is_alias_referenced, $referenced_by);
-		//find_alias_reference(array('nat', 'onetoone'), array('source', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('nat', 'onetoone'), array('destination', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
-		// NAT Outbound Rules
-		find_alias_reference(array('nat', 'advancedoutbound', 'rule'), array('source', 'network'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('nat', 'advancedoutbound', 'rule'), array('sourceport'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('nat', 'advancedoutbound', 'rule'), array('destination', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('nat', 'advancedoutbound', 'rule'), array('dstport'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('nat', 'advancedoutbound', 'rule'), array('target'), $alias_name, $is_alias_referenced, $referenced_by);
-		// Alias in an alias
-		find_alias_reference(array('aliases', 'alias'), array('address'), $alias_name, $is_alias_referenced, $referenced_by);
-		// Load Balancer
-		find_alias_reference(array('load_balancer', 'lbpool'),         array('port'), $alias_name, $is_alias_referenced, $referenced_by);
-		find_alias_reference(array('load_balancer', 'virtual_server'), array('port'), $alias_name, $is_alias_referenced, $referenced_by);
-		// Static routes
-		find_alias_reference(array('staticroutes', 'route'), array('network'), $alias_name, $is_alias_referenced, $referenced_by);
-		if($is_alias_referenced) {
-			$savemsg = sprintf(gettext("Cannot delete alias. Currently in use by %s"), $referenced_by);
-		} else {
-			unset($a_aliases[$_POST['id']]);
-			if (write_config()) {
+		if (isset($_POST['apply'])) {
+				/* reload all components that use aliases */
 				filter_configure();
-				mark_subsystem_dirty('aliases');
-			}
-				header("Location: firewall_aliases.php?tab=" . $selected_tab);
-			exit;
+				$savemsg = get_std_save_message();
+				clear_subsystem_dirty('aliases');
+		} elseif (isset($_POST['act']) && $_POST['act'] == "del") {
+				if (isset($_POST['id']) && isset($a_aliases[$_POST['id']])) {
+						// perform validation
+						/* make sure rule is not being referenced by any nat or filter rules */
+						$is_alias_referenced = false;
+						$referenced_by = false;
+						$alias_name = $a_aliases[$_POST['id']]['name'];
+						// Firewall rules
+						find_alias_reference(array('filter', 'rule'), array('source', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('filter', 'rule'), array('destination', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('filter', 'rule'), array('source', 'port'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('filter', 'rule'), array('destination', 'port'), $alias_name, $is_alias_referenced, $referenced_by);
+						// NAT Rules
+						find_alias_reference(array('nat', 'rule'), array('source', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('nat', 'rule'), array('source', 'port'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('nat', 'rule'), array('destination', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('nat', 'rule'), array('destination', 'port'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('nat', 'rule'), array('target'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('nat', 'rule'), array('local-port'), $alias_name, $is_alias_referenced, $referenced_by);
+						// NAT 1:1 Rules
+						//find_alias_reference(array('nat', 'onetoone'), array('external'), $alias_name, $is_alias_referenced, $referenced_by);
+						//find_alias_reference(array('nat', 'onetoone'), array('source', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('nat', 'onetoone'), array('destination', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
+						// NAT Outbound Rules
+						find_alias_reference(array('nat', 'advancedoutbound', 'rule'), array('source', 'network'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('nat', 'advancedoutbound', 'rule'), array('sourceport'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('nat', 'advancedoutbound', 'rule'), array('destination', 'address'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('nat', 'advancedoutbound', 'rule'), array('dstport'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('nat', 'advancedoutbound', 'rule'), array('target'), $alias_name, $is_alias_referenced, $referenced_by);
+						// Alias in an alias
+						find_alias_reference(array('aliases', 'alias'), array('address'), $alias_name, $is_alias_referenced, $referenced_by);
+						// Load Balancer
+						find_alias_reference(array('load_balancer', 'lbpool'),         array('port'), $alias_name, $is_alias_referenced, $referenced_by);
+						find_alias_reference(array('load_balancer', 'virtual_server'), array('port'), $alias_name, $is_alias_referenced, $referenced_by);
+						// Static routes
+						find_alias_reference(array('staticroutes', 'route'), array('network'), $alias_name, $is_alias_referenced, $referenced_by);
+						if($is_alias_referenced) {
+							$savemsg = sprintf(gettext("Cannot delete alias. Currently in use by %s"), $referenced_by);
+						} else {
+							unset($a_aliases[$_POST['id']]);
+							if (write_config()) {
+								filter_configure();
+								mark_subsystem_dirty('aliases');
+							}
+								header("Location: firewall_aliases.php?tab=" . $selected_tab);
+							exit;
+						}
+				}
 		}
-    }
-  }
 }
 
 
@@ -157,16 +157,16 @@ $( document ).ready(function() {
 				title: "<?= gettext("Aliasses");?>",
 				message: "<?=gettext("Do you really want to delete this alias? All elements that still use it will become invalid (e.g. filter rules)!");?>",
 				buttons: [{
-                label: "<?= gettext("No");?>",
-                action: function(dialogRef) {
-                    dialogRef.close();
-                }}, {
+								label: "<?= gettext("No");?>",
+								action: function(dialogRef) {
+									dialogRef.close();
+								}}, {
 									label: "<?= gettext("Yes");?>",
 									action: function(dialogRef) {
 										$("#delId").val(id);
 										$("#iform").submit()
 								}
-            }]
+				}]
 		});
 	});
 });
@@ -189,12 +189,12 @@ $( document ).ready(function() {
 							display_top_tabs($tab_array);
 ?>
 					<div class="tab-content content-box col-xs-12">
-            <form action="firewall_aliases.php" method="post" name="iform" id="iform">
-              <input type="hidden" name="tab" value="<?=$selected_tab;?>" />
+						<form action="firewall_aliases.php" method="post" name="iform" id="iform">
+							<input type="hidden" name="tab" value="<?=$selected_tab;?>" />
 							<input type="hidden" name="id" value="" id="delId"/>
 							<input type="hidden" name="act" value="del"/>
-                <div class="table-responsive">
-                  <table class="table table-striped">
+								<div class="table-responsive">
+									<table class="table table-striped">
 										<tr>
 											<td><?=gettext("Name"); ?></td>
 											<td><?=gettext("Values"); ?></td>
@@ -246,33 +246,33 @@ $( document ).ready(function() {
 												    }
 											}
 ?>
-                      <td ondblclick="document.location='firewall_aliases_edit.php?id=<?=$i;?>';">
-                        <?= htmlspecialchars($alias_values); ?>
+											<td ondblclick="document.location='firewall_aliases_edit.php?id=<?=$i;?>';">
+												<?= htmlspecialchars($alias_values); ?>
 											</td>
 											<td ondblclick="document.location='firewall_aliases_edit.php?id=<?=$i;?>';">
 												<?=htmlspecialchars($alias['descr']);?>
 											</td>
 											<td>
-                        <a href="firewall_aliases_edit.php?id=<?=$i;?>" title="<?=gettext("Edit alias"); ?>" class="btn btn-default btn-xs"><span class="glyphicon glyphicon-pencil"></span></a>
-                        <a id="del_<?=$i;?>" title="<?=gettext("delete alias"); ?>" class="act_delete btn btn-default btn-xs"><span class="glyphicon glyphicon-remove"></span></a>
+												<a href="firewall_aliases_edit.php?id=<?=$i;?>" title="<?=gettext("Edit alias"); ?>" class="btn btn-default btn-xs"><span class="glyphicon glyphicon-pencil"></span></a>
+												<a id="del_<?=$i;?>" title="<?=gettext("delete alias"); ?>" class="act_delete btn btn-default btn-xs"><span class="glyphicon glyphicon-remove"></span></a>
 											</td>
 										</tr>
 <?php
 											} // if ($show_alias)
 										} // foreach
 ?>
-						      </table>
-                  <div class="container-fluid">
-								    <span class="text-danger">
-                      <strong><?=gettext("Note:"); ?><br />
-                      </strong></span>
-                    </span>
-                    <?=gettext("Aliases act as placeholders for real hosts, networks or ports. They can be used to minimize the number of changes that have to be made if a host, network or port changes. You can enter the name of an alias instead of the host, network or port in all fields that have a red background. The alias will be resolved according to the list above. If an alias cannot be resolved (e.g. because you deleted it), the corresponding element (e.g. filter/NAT/shaper rule) will be considered invalid and skipped."); ?>
-							    </div>
-	          </form>
+								</table>
+								<div class="container-fluid">
+									<span class="text-danger">
+										<strong><?=gettext("Note:"); ?><br />
+										</strong></span>
+									</span>
+									<?=gettext("Aliases act as placeholders for real hosts, networks or ports. They can be used to minimize the number of changes that have to be made if a host, network or port changes. You can enter the name of an alias instead of the host, network or port in all fields that have a red background. The alias will be resolved according to the list above. If an alias cannot be resolved (e.g. because you deleted it), the corresponding element (e.g. filter/NAT/shaper rule) will be considered invalid and skipped."); ?>
+								</div>
+						</form>
 					</div>
-			  </section>
+				</section>
 			</div>
-	   </div>
+		</div>
 	</section>
 <?php include("foot.inc"); ?>