diff --git a/includes/bootstrap.inc b/includes/bootstrap.inc
index 6cb6323e89b2705cc017945fdce734d2ddf0ef63..e170f27ac12fdf6b0bf5173d77ee00038d152f1e 100644
--- a/includes/bootstrap.inc
+++ b/includes/bootstrap.inc
@@ -216,7 +216,7 @@
 
 // Hide E_DEPRECATED messages.
 if (defined('E_DEPRECATED')) {
-  error_reporting(error_reporting() ^ E_DEPRECATED);
+  error_reporting(error_reporting() & ~E_DEPRECATED);
 }
 
 /**