diff --git a/upstart-jobs/xserver/xserver.conf b/upstart-jobs/xserver/xserver.conf
index 36e9da8bf0fe..145d31e31920 100644
--- a/upstart-jobs/xserver/xserver.conf
+++ b/upstart-jobs/xserver/xserver.conf
@@ -9,6 +9,7 @@ EndSection
 
 Section "ServerFlags"
   Option "AllowMouseOpenFail" "on"
+  Option "AllowEmptyInput" "off"  
 EndSection