diff --git a/scratch b/scratch
index c127737..ace3433 100755
--- a/scratch
+++ b/scratch
@@ -462,7 +462,7 @@ scratch_foreignpkg() {
 
 scratch_trigger() {
 	needroot "Run trigger"
-	if [ -z "$@" ]; then
+	if [[ -z "$@" ]]; then
 		for i in trig_{1..12}; do
 			eval $i=1
 		done