diff --git a/nginx-upgrade b/nginx-upgrade
index 70f71e5..f84d91a 100644
--- a/nginx-upgrade
+++ b/nginx-upgrade
@@ -3,11 +3,17 @@
 echo "Start new nginx master..."
 /bin/systemctl kill --signal=SIGUSR2 nginx.service
 sleep 5
-[ ! -f /run/nginx.pid.oldbin ] && sleep 5
+[ ! -f /run/nginx.pid.oldbin ] && sleep 10
 if [ ! -f /run/nginx.pid.oldbin ]; then
-	echo "Failed to start new nginx master."
-	exit 1
+    echo "Failed to start new nginx master."
+    exit 1
 fi
 echo "Stop old nginx master gracefully..."
-oldpid=`cat /run/nginx.pid.oldbin 2>/dev/null`
+oldpid=`/usr/bin/cat /run/nginx.pid.oldbin 2>/dev/null`
 /bin/kill -s QUIT $oldpid 2>/dev/null
+sleep 5
+[ -f /run/nginx.pid.oldbin ] && sleep 10
+if [ -f /run/nginx.pid.oldbin ]; then
+    echo "Failed to stop old nginx master."
+    exit 1
+fi