diff --git a/scripts/zmap_x11_functions.sh b/scripts/zmap_x11_functions.sh
index f6e8157610074f213149d48cdbd562a694cf4809..13c7f89288de1f8b409fb4ac9124803a0cf54570 100755
--- a/scripts/zmap_x11_functions.sh
+++ b/scripts/zmap_x11_functions.sh
@@ -2,7 +2,7 @@
 
 X11_ENVIRONMENT_FILE=/tmp/zmap.$$.env
 XSERVER_PATH=Xvnc
-XSERVER_OPTIONS="-terminate -desktop ${USER}-running-$SCRIPT_NAME"
+XSERVER_OPTIONS="-terminate -desktop ${USER}-running-$SCRIPT_NAME -depth 24"
 XSERVER_ADD_OPTIONS="-rfbauth $HOME/.vnc/passwd"
 VNC_PASSWD=tesswheat
 # ah, test suite