diff --git a/includes/functions/core.php b/includes/functions/core.php
index bf5bb10..d92b1af 100644
--- a/includes/functions/core.php
+++ b/includes/functions/core.php
@@ -75,7 +75,7 @@ function deactivate() {
  * @return string|WP_Error URL
  */
 function script_url( $script ) {
-	return AD_REFRESH_CONTROL_URL . "dist/js/${script}.js";
+	return AD_REFRESH_CONTROL_URL . "dist/js/{$script}.js";
 }
 
 /**