diff --git a/launch-game.sh b/launch-game.sh
index 244b6f1f76..9a0072aad5 100755
--- a/launch-game.sh
+++ b/launch-game.sh
@@ -13,7 +13,7 @@ fi
 
 # Prompt for a mod to launch if one is not already specified
 MODARG=''
-if [ z"${*#*Game.Mod}" = z"$*" ]
+if [ z"${*#*Game.Mod=}" = z"$*" ]
 then
 	if command -v zenity > /dev/null
 	then