diff --git a/scripts/pi-hole/php/header.php b/scripts/pi-hole/php/header.php
index 6f30d51d..d522bcda 100644
--- a/scripts/pi-hole/php/header.php
+++ b/scripts/pi-hole/php/header.php
@@ -16,7 +16,7 @@
     check_cors();
     
     // Create cache busting version
-    $cacheVer = filectime(__FILE__);
+    $cacheVer = filemtime(__FILE__);
 
     // Generate CSRF token
     if(empty($_SESSION['token'])) {