diff --git a/platform/kobo/koreader.sh b/platform/kobo/koreader.sh
index 733db0d79..91539f97a 100755
--- a/platform/kobo/koreader.sh
+++ b/platform/kobo/koreader.sh
@@ -89,7 +89,7 @@ else
 	# if we were called from advboot then we must reboot to go to the menu
 	# NOTE: This is actually achieved by checking if KSM is running:
 	#       This might lead to false-positives if you use neither KSM nor advboot to launch KOReader *without nickel running*.
-	if ! pkill -0 ksmhome.sh ; then
+	if ! pidof ksmhome.sh > /dev/null 2>&1 ; then
 		reboot
 	fi
 fi