diff --git a/pkgs/misc/dxvk/setup_dxvk.sh b/pkgs/misc/dxvk/setup_dxvk.sh
index ccd5d54d0892..33734044494b 100644
--- a/pkgs/misc/dxvk/setup_dxvk.sh
+++ b/pkgs/misc/dxvk/setup_dxvk.sh
@@ -42,7 +42,7 @@ usage() {
     exit 1
 }
 
-case "$1" in
+case "${1:-}" in
     uninstall|install)
         action=$1
         shift