diff --git a/plugins/op_waf/waf/lua/init.lua b/plugins/op_waf/waf/lua/init.lua
index 79c8862ba..d5c77f124 100644
--- a/plugins/op_waf/waf/lua/init.lua
+++ b/plugins/op_waf/waf/lua/init.lua
@@ -438,7 +438,7 @@ local function post_X_Forwarded()
     if not config['post']['open'] or not C:is_site_config('post') then return false end   
     if params['method'] ~= "POST" then return false end
     if not params["request_header"]['X-forwarded-For'] then return false end
-    if C:is_ngx_match_list(post_rules, params["request_header"]['X-forwarded-For']) then
+    if C:ngx_match_list(post_rules, params["request_header"]['X-forwarded-For']) then
         C:write_log('post','regular')
         C:return_html(config['post']['status'], post_html)
         return true