diff --git a/library/Icinga/Application/ApplicationBootstrap.php b/library/Icinga/Application/ApplicationBootstrap.php
index 368c93a8f..7d22eaafa 100644
--- a/library/Icinga/Application/ApplicationBootstrap.php
+++ b/library/Icinga/Application/ApplicationBootstrap.php
@@ -388,6 +388,7 @@ abstract class ApplicationBootstrap
                 return false; // Continue with the normal error handler
             }
             switch($errno) {
+                case E_WARNING:
                 case E_STRICT:
                     throw new ErrorException($errstr, 0, $errno, $errfile, $errline);
             }