diff --git a/luci-app-passwall/root/usr/share/passwall/rule_update.lua b/luci-app-passwall/root/usr/share/passwall/rule_update.lua
index 4db7e26ae..469e4ea02 100755
--- a/luci-app-passwall/root/usr/share/passwall/rule_update.lua
+++ b/luci-app-passwall/root/usr/share/passwall/rule_update.lua
@@ -466,11 +466,8 @@ luci.sys.call("uci commit " .. name)
 
 if reboot == 1 then
 	if arg3 == "cron" then
-		local f = io.open("/var/lock/" .. name .. ".lock", "r")
-		if f == nil then
+		if not nixio.fs.access("/var/lock/" .. name .. ".lock") then
 			luci.sys.call("touch /tmp/lock/" .. name .. "_cron.lock")
-		else
-			f:close()
 		end
 	end
 
diff --git a/luci-app-passwall/root/usr/share/passwall/subscribe.lua b/luci-app-passwall/root/usr/share/passwall/subscribe.lua
index 8fe660179..edf23b44f 100755
--- a/luci-app-passwall/root/usr/share/passwall/subscribe.lua
+++ b/luci-app-passwall/root/usr/share/passwall/subscribe.lua
@@ -1166,11 +1166,8 @@ local function update_node(manual)
 	end
 
 	if arg[3] == "cron" then
-		local f = io.open("/var/lock/" .. appname .. ".lock", "r")
-		if f == nil then
+		if not nixio.fs.access("/var/lock/" .. appname .. ".lock") then
 			luci.sys.call("touch /tmp/lock/" .. appname .. "_cron.lock")
-		else
-			f:close()
 		end
 	end