diff --git a/src/js/static-net-filtering.js b/src/js/static-net-filtering.js
index 89dc895a2..f71964f1a 100644
--- a/src/js/static-net-filtering.js
+++ b/src/js/static-net-filtering.js
@@ -1287,8 +1287,8 @@ FilterBucket.fromSelfie = function() {
 /******************************************************************************/
 
 var FilterParser = function() {
-    this.reHostnameRule1 = /^[0-9a-z][0-9a-z.-]*[0-9a-z]$/;
-    this.reHostnameRule2 = /^\**[0-9a-z][0-9a-z.-]*[0-9a-z]\^?$/;
+    this.reHostnameRule1 = /^[0-9a-z][0-9a-z.-]*[0-9a-z]$/i;
+    this.reHostnameRule2 = /^\**[0-9a-z][0-9a-z.-]*[0-9a-z]\^?$/i;
     this.reCleanupHostnameRule2 = /^\**|\^$/g;
     this.reHasWildcard = /[\^\*]/;
     this.reCanTrimCarets1 = /^[^*]*$/;