diff --git a/dlls/rpcrt4/rpcrt4.spec b/dlls/rpcrt4/rpcrt4.spec
index 6d7d0fbf7ac..5d558bff753 100644
--- a/dlls/rpcrt4/rpcrt4.spec
+++ b/dlls/rpcrt4/rpcrt4.spec
@@ -413,8 +413,8 @@
 @ stdcall RpcMgmtWaitServerListen()
 @ stdcall RpcNetworkInqProtseqsA(ptr)
 @ stdcall RpcNetworkInqProtseqsW(ptr)
-@ stdcall RpcNetworkIsProtseqValidA(ptr)
-@ stdcall RpcNetworkIsProtseqValidW(ptr)
+@ stdcall RpcNetworkIsProtseqValidA(str)
+@ stdcall RpcNetworkIsProtseqValidW(wstr)
 @ stub RpcNsBindingInqEntryNameA
 @ stub RpcNsBindingInqEntryNameW
 @ stub RpcObjectInqType