diff --git a/package/lean/autocore/files/arm/index.htm b/package/lean/autocore/files/arm/index.htm
index 283339443..4f884744e 100644
--- a/package/lean/autocore/files/arm/index.htm
+++ b/package/lean/autocore/files/arm/index.htm
@@ -48,7 +48,7 @@
 
 		local user_info = luci.sys.exec("cat /proc/net/arp | grep 'br-lan' | grep '0x2' | wc -l")
 
-		local cpu_usage = (luci.sys.exec("expr 100 - $(top -n 1 | grep 'CPU:' | awk -F '%' '{print$4}' | awk -F ' ' '{print$2}')") or "6") .. "%"
+		local cpu_usage = luci.sys.exec("top -n1 | awk '/^CPU/ { printf(\"%d%%\", 100 - $8) }'") or "6%"
 		local cpu_info = luci.sys.exec("/sbin/cpuinfo") or "ARM Processor x 0 (233MHz, 2.3°C)"
 
 		local rv = {