diff --git a/upstart-jobs/xserver.conf b/upstart-jobs/xserver.conf
index 36e9da8bf0f..b1d3a11e97b 100644
--- a/upstart-jobs/xserver.conf
+++ b/upstart-jobs/xserver.conf
@@ -9,6 +9,7 @@ EndSection
 
 Section "ServerFlags"
   Option "AllowMouseOpenFail" "on"
+  Option "AllowEmptyInput" "off"
 EndSection