diff --git a/checksum.go b/checksum.go
index db47eef..4979286 100644
--- a/checksum.go
+++ b/checksum.go
@@ -34,7 +34,7 @@ func isLeanworkFormValid(form url.Values) bool {
 	return r == sign
 }
 
-func md4RpnFormP2P(r RpnReq) string {
+func md5RpnFormP2P(r RpnReq) string {
 	return md5RpnForm(r, Config.Rpn.MD5P2P)
 }