diff --git a/src/js/static-ext-filtering.js b/src/js/static-ext-filtering.js
index 1b1533d95..70c7ce988 100644
--- a/src/js/static-ext-filtering.js
+++ b/src/js/static-ext-filtering.js
@@ -124,7 +124,7 @@
     };
 
     const translateAdguardCSSInjectionFilter = function(suffix) {
-        const matches = /^([^{]+)\{([^}]+)\}$/.exec(suffix);
+        const matches = /^([^{]+)\{([^}]+)\}\s*$/.exec(suffix);
         if ( matches === null ) { return ''; }
         const selector = matches[1].trim();
         const style = matches[2].trim();