diff --git a/includes/bootstrap.inc b/includes/bootstrap.inc
index 16e2cc9960122b605b4a340ca2741a62702d459d..6cb6323e89b2705cc017945fdce734d2ddf0ef63 100644
--- a/includes/bootstrap.inc
+++ b/includes/bootstrap.inc
@@ -214,6 +214,11 @@
  */
 define('LANGUAGE_RTL', 1);
 
+// Hide E_DEPRECATED messages.
+if (defined('E_DEPRECATED')) {
+  error_reporting(error_reporting() ^ E_DEPRECATED);
+}
+
 /**
  * Start the timer with the specified name. If you start and stop
  * the same timer multiple times, the measured intervals will be