diff --git a/buzzer.sh b/buzzer.sh
index 6fc64b8..c992090 100755
--- a/buzzer.sh
+++ b/buzzer.sh
@@ -54,7 +54,7 @@ while true; do
 		swupstat="$($cmdgpio read $swupgpio)"
                	
 
-		while $(command -v pgrep) "$pgrepplayer" > /dev/null; do
+		while [ ! -z "$($(command -v pgrep) "$pgrepplayer")" ]; do
 			$(command -v pkill) "$pgrepplayer"
 		done