diff --git a/package/lean/autocore/files/x86/index.htm b/package/lean/autocore/files/x86/index.htm
index 6f4c7ac70bae1e..84538c53daaf49 100644
--- a/package/lean/autocore/files/x86/index.htm
+++ b/package/lean/autocore/files/x86/index.htm
@@ -52,7 +52,7 @@
 
 		local user_info = luci.sys.exec("cat /proc/net/arp | grep '0x2' | wc -l") or 0
 		
-		local cpu_usage = (luci.sys.exec("expr 100 - $(top -n 1 | grep 'CPU:' | awk -F '%' '{print$4}' | awk -F ' ' '{print$2}' | awk '{print int($1 + 0.5)}')") or "6") .. "%"
+		local cpu_usage = (luci.sys.exec("expr 100 - $(top -n 1 | grep -E '^CPU:' | awk -F '%' '{print$4}' | awk -F ' ' '{print$2}' | awk '{print int($1 + 0.5)}')") or "6") .. "%"
 
 		local rv = {
 			cpuusage    = cpu_usage,