diff --git a/plugins/op_waf/index.py b/plugins/op_waf/index.py
index 2075757cc..99cdeac13 100755
--- a/plugins/op_waf/index.py
+++ b/plugins/op_waf/index.py
@@ -842,7 +842,7 @@ def setSafeVerify():
     cobj = json.loads(content)
 
     cobj['safe_verify']['time'] = args['time']
-    cobj['safe_verify']['cpu'] = args['cpu']
+    cobj['safe_verify']['cpu'] = int(args['cpu'])
 
     if args['auto'] == '0':
         cobj['safe_verify']['auto'] = False