diff --git a/dlls/rpcrt4/rpcrt4.spec b/dlls/rpcrt4/rpcrt4.spec
index 2c86e68032f..56a55f6ed20 100644
--- a/dlls/rpcrt4/rpcrt4.spec
+++ b/dlls/rpcrt4/rpcrt4.spec
@@ -203,7 +203,7 @@
 @ stub NdrGetSimpleTypeBufferSize # wxp
 @ stub NdrGetSimpleTypeMemorySize # wxp
 @ stub NdrGetTypeFlags # wxp
-@ stub NdrGetUserMarshallInfo
+@ stdcall NdrGetUserMarshalInfo(ptr long ptr)
 @ stub NdrHardStructBufferSize #(ptr ptr ptr)
 @ stub NdrHardStructFree #(ptr ptr ptr)
 @ stub NdrHardStructMarshall #(ptr ptr ptr)
diff --git a/dlls/rpcrt4/rpcrt4_main.c b/dlls/rpcrt4/rpcrt4_main.c
index 537a00537bc..1a6b61dd90c 100644
--- a/dlls/rpcrt4/rpcrt4_main.c
+++ b/dlls/rpcrt4/rpcrt4_main.c
@@ -1016,3 +1016,9 @@ RPC_STATUS RPC_ENTRY RpcCancelThreadEx(void* ThreadHandle, LONG Timeout)
     else
         return rpc_cancel_thread(target_tid);
 }
+
+RPC_STATUS RPC_ENTRY NdrGetUserMarshalInfo(ULONG *flags, ULONG level, NDR_USER_MARSHAL_INFO *mi)
+{
+    FIXME("(%p, %u, %p)\n", flags, level, mi);
+    return RPC_X_INVALID_BUFFER;
+}