diff --git a/disko b/disko
index f361ebb..10e2fc2 100755
--- a/disko
+++ b/disko
@@ -87,7 +87,7 @@ while [[ $# -gt 0 ]]; do
   shift
 done
 
-if ! ([[ $mode = "create" ]] || [[ $mode = "mount" ]] || [[ $mode = "zap_create_mount" ]]); then
+if ! { [[ $mode = "create" ]] || [[ $mode = "mount" ]] || [[ $mode = "zap_create_mount" ]]; }; then
   abort "mode must be either create, mount or zap_create_mount"
 fi