diff --git a/waf.lua b/waf.lua
index d6fed1b..16cda02 100644
--- a/waf.lua
+++ b/waf.lua
@@ -1,4 +1,4 @@
-if  ngx.re.match(ngx.var.request_uri,whitelist,"i") then
+if  ngx.re.match(ngx.var.request_uri,whitelist,"isjo") then
     return
 elseif ngx.req.get_body_data() and ngx.re.match(ngx.req.get_body_data(),[[^(?!Content-Disposition: form-data;(.*)filename="(.*).(php|jsp|phtml|asp|aspx|cgi)").*$]],"isjo") then
     return