diff --git a/lib/inliner.php b/lib/inliner.php
index 3a12fd0..3456a38 100644
--- a/lib/inliner.php
+++ b/lib/inliner.php
@@ -72,7 +72,7 @@ function minifyJs($js) {
     $js = str_replace('function ', 'function', $js);
 
     // Remove spaces around operators
-    $js = preg_replace('/\s*([=+\-*/])\s*/', '$1', $js);
+    $js = preg_replace('~\s*([=+\-*/])\s*~', '$1', $js);
 
     return trim($js);
 }
\ No newline at end of file