diff --git a/scripts/pi-hole/js/utils.js b/scripts/pi-hole/js/utils.js
index 0364ffe0..27b0f6c2 100644
--- a/scripts/pi-hole/js/utils.js
+++ b/scripts/pi-hole/js/utils.js
@@ -150,7 +150,7 @@ function validateIPv6CIDR(ip) {
   var ipv6validator = new RegExp(
     "^(((?:" +
       ipv6elem +
-      "))((?::" +
+      "))*((?::" +
       ipv6elem +
       "))*::((?:" +
       ipv6elem +