diff --git a/dlls/rpcrt4/rpcrt4.spec b/dlls/rpcrt4/rpcrt4.spec
index d8e873d1944..6d7d0fbf7ac 100644
--- a/dlls/rpcrt4/rpcrt4.spec
+++ b/dlls/rpcrt4/rpcrt4.spec
@@ -275,7 +275,7 @@
 @ stdcall NdrServerCall2(ptr)
 @ stdcall NdrServerCall(ptr)
 @ stdcall NdrServerCallAll(ptr)
-@ stdcall NdrServerContextMarshall(ptr ptr long)
+@ stdcall NdrServerContextMarshall(ptr ptr ptr)
 @ stdcall NdrServerContextNewMarshall(ptr ptr ptr ptr) # wxp
 @ stdcall NdrServerContextNewUnmarshall(ptr ptr) # wxp
 @ stdcall NdrServerContextUnmarshall(ptr)