diff --git a/src/js/static-filtering-parser.js b/src/js/static-filtering-parser.js
index ccdfa506c..dd4ff1b8a 100644
--- a/src/js/static-filtering-parser.js
+++ b/src/js/static-filtering-parser.js
@@ -1169,8 +1169,8 @@ const Parser = class {
         if ( asDataURI ) { token = token.slice(1); }
         const match = /:-?\d+$/.exec(token);
         if ( match !== null ) {
-            token = token.slice(0, match.index);
             priority = parseInt(token.slice(match.index + 1), 10);
+            token = token.slice(0, match.index);
         }
         return { token, priority, asDataURI };
     }