diff --git a/SOURCES/ssh-x-forwarding.csh b/SOURCES/ssh-x-forwarding.csh
index 10d87ed..be38241 100644
--- a/SOURCES/ssh-x-forwarding.csh
+++ b/SOURCES/ssh-x-forwarding.csh
@@ -1,6 +1,7 @@
 # DBus session bus over SSH with X11 forwarding
 if ( $?SSH_CONNECTION == 0 ) exit
 if ( $?DISPLAY == 0 ) exit
+if ( $DISPLAY =~ :* ) exit
 if ( $SHLVL > 1 ) exit
 setenv GDK_BACKEND x11