diff --git a/src/js/static-ext-filtering.js b/src/js/static-ext-filtering.js
index 5d27d4a86..dea5ad303 100644
--- a/src/js/static-ext-filtering.js
+++ b/src/js/static-ext-filtering.js
@@ -494,7 +494,7 @@
     //   Do not discard unknown pseudo-elements.
 
     api.compileSelector = (function() {
-        var reAfterBeforeSelector = /^(.+?)(::?after|::?before|::[a-z-])$/,
+        var reAfterBeforeSelector = /^(.+?)(::?after|::?before|::[a-z-]+)$/,
             reStyleSelector = /^(.+?):style\((.+?)\)$/,
             reStyleBad = /url\([^)]+\)/,
             reExtendedSyntax = /\[-(?:abp|ext)-[a-z-]+=(['"])(?:.+?)(?:\1)\]/,