diff --git a/src/etc/inc/interfaces.inc b/src/etc/inc/interfaces.inc
index cb057e526..ff733fc1c 100644
--- a/src/etc/inc/interfaces.inc
+++ b/src/etc/inc/interfaces.inc
@@ -3416,7 +3416,7 @@ function interface_dhcpv6_configure($interface = 'wan', $wancfg)
             $dhcp6cconf = file_get_contents($dhcp6cfile);
             $dhcp6cconf = DHCP6_Config_File_Substitutions($wancfg, $wanif, $dhcp6cconf);
         } else {
-            log_error(sprintf('DHCP6 config file override does not exist: %s', $dhcp6cfile));
+            log_error(sprintf('DHCP6 config file override does not exist: "%s"', $dhcp6cfile));
         }
     }
 
@@ -3739,7 +3739,7 @@ EOD;
             $dhclientconf = file_get_contents($dhclientfile);
             $dhclientconf = DHCP_Config_File_Substitutions($wancfg, $wanif, $dhclientconf);
         } else {
-            log_error(sprintf('DHCP config file override does not exist: %s', $dhclientfile));
+            log_error(sprintf('DHCP config file override does not exist: "%s"', $dhclientfile));
         }
     }
 
diff --git a/src/www/interfaces.php b/src/www/interfaces.php
index 699728b3e..30a63ac59 100644
--- a/src/www/interfaces.php
+++ b/src/www/interfaces.php
@@ -611,6 +611,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
                 if (in_array($a_interfaces[$if]['ipaddr'], array("ppp", "pppoe", "pptp", "l2tp"))) {
                     $input_errors[] = sprintf(gettext("You have to reassign the interface to be able to configure as %s."),$pconfig['type']);
                 }
+                if (!empty($pconfig['adv_dhcp_config_file_override'] && !file_exists($pconfig['adv_dhcp_config_file_override_path']))) {
+                    $input_errors[] = sprintf(gettext('The DHCP override file "%s" does not exist.'), $pconfig['adv_dhcp_config_file_override_path']);
+                }
                 break;
             case "ppp":
                 $reqdfields = explode(" ", "ports phone");
@@ -654,6 +657,11 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
                 $reqdfieldsn = array(gettext("IPv6 address"),gettext("Subnet bit count"),gettext("Gateway"));
                 do_input_validation($pconfig, $reqdfields, $reqdfieldsn, $input_errors);
                 break;
+            case "dhcp6":
+                if (!empty($pconfig['adv_dhcp6_config_file_override'] && !file_exists($pconfig['adv_dhcp6_config_file_override_path']))) {
+                    $input_errors[] = sprintf(gettext('The DHCPv6 override file "%s" does not exist.'), $pconfig['adv_dhcp6_config_file_override_path']);
+                }
+                break;
             case "none":
                 if (isset($config['virtualip']['vip'])) {
                     foreach ($config['virtualip']['vip'] as $vip) {
@@ -2046,7 +2054,7 @@ include("head.inc");
                           </td>
                         </tr>
                         <tr class="dhcp_file_override">
-                          <td><a id="help_for_dhcp_config_file_override_path" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a>  <?=gettext("Config File Override");?>
+                          <td><a id="help_for_dhcp_config_file_override_path" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Configuration File Override");?>
                           <td>
                             <input name="adv_dhcp_config_file_override_path"   type="text" id="adv_dhcp_config_file_override_path"  value="<?=$pconfig['adv_dhcp_config_file_override_path'];?>" />
                             <div class="hidden" for="help_for_dhcp_config_file_override_path">