diff --git a/bluetooth_bcm43xx/run.sh b/bluetooth_bcm43xx/run.sh
index d8a92e7..d7e53d9 100644
--- a/bluetooth_bcm43xx/run.sh
+++ b/bluetooth_bcm43xx/run.sh
@@ -4,7 +4,7 @@ set -e
 hciattach /dev/ttyAMA0 bcm43xx 115200 noflow -
 hciconfig hci0 up
 
-while pgrep hciattach
+while pgrep hciattach > /dev/null
 do
   sleep 600
 done