diff --git a/RandomVideo.sh b/RandomVideo.sh
index d805778..c113856 100755
--- a/RandomVideo.sh
+++ b/RandomVideo.sh
@@ -13,7 +13,7 @@ if [ $# -gt 1 ]; then
 	exit 1
 fi
 
-if [ "buzzer" != "$1" -a "cron" != "$1" ]; then
+if [ "buzzer" != "$1" ] && [ "cron" != "$1" ]; then
 	echo "Parameter muss \"buzzer\" oder \"cron\" sein"
 	exit 1
 fi