diff --git a/src/Monolog/ErrorHandler.php b/src/Monolog/ErrorHandler.php
index d0b1aa6d..dfccaa9f 100644
--- a/src/Monolog/ErrorHandler.php
+++ b/src/Monolog/ErrorHandler.php
@@ -166,6 +166,10 @@ class ErrorHandler
             call_user_func($this->previousExceptionHandler, $e);
         }
 
+        if (!headers_sent() && ini_get('display_errors') === 0) {
+            http_response_code(500);
+        }
+
         exit(255);
     }