diff --git a/src/js/static-net-filtering.js b/src/js/static-net-filtering.js
index 80767b548..a0ea78ba6 100644
--- a/src/js/static-net-filtering.js
+++ b/src/js/static-net-filtering.js
@@ -3362,7 +3362,7 @@ class FilterCompiler {
         if ( pattern.startsWith('|') ) {
             return this.extractTokenFromRegex('\\b' + pattern.slice(1));
         }
-        this.extractTokenFromPattern(encodeURIComponent(pattern).toLowerCase());
+        this.extractTokenFromPattern(pattern.toLowerCase());
     }
 
     hasNoOptionUnits() {