diff --git a/src/etc/inc/IPv6.inc b/src/etc/inc/IPv6.inc
index ac85b218e..273495b74 100644
--- a/src/etc/inc/IPv6.inc
+++ b/src/etc/inc/IPv6.inc
@@ -589,8 +589,10 @@ class Net_IPv6
             $cip = preg_replace('/' . $match . '/', ':', $cip, 1);
         }
 
-        $cip = preg_replace('/((^:)|(:$))/', '', $cip);
-        $cip = preg_replace('/((^:)|(:$))/', '::', $cip);
+        if ($cip != '::') {
+            $cip = preg_replace('/((^:)|(:$))/', '', $cip);
+            $cip = preg_replace('/((^:)|(:$))/', '::', $cip);
+        }
 
         if ('' != $netmask) {
             $cip = $cip . '/' . $netmask;