diff --git a/lib/exe/css.php b/lib/exe/css.php
index 6dfdf06e899c17abdbaca9b6d2e5e3de0ea81c02..f0bd24b43a24f2e975e34f21daae13a207835b73 100644
--- a/lib/exe/css.php
+++ b/lib/exe/css.php
@@ -422,7 +422,7 @@ function css_datauri($match){
         $data = base64_encode(file_get_contents($local));
     }
     if($data){
-        $url = '\'data:image/'.$ext.';base64,'.$data.'\'';
+        $url = 'data:image/'.$ext.';base64,'.$data;
     }else{
         $url = $base.$url;
     }