diff --git a/dlls/rpcrt4/Makefile.in b/dlls/rpcrt4/Makefile.in
index b5fca242efe..5a04b54e7c2 100644
--- a/dlls/rpcrt4/Makefile.in
+++ b/dlls/rpcrt4/Makefile.in
@@ -1,4 +1,4 @@
-EXTRADEFS = -D_RPCRT4_ -DCOM_NO_WINDOWS_H
+EXTRADEFS = -D_RPCRT4_ -DCOM_NO_WINDOWS_H -DMSWMSG
 TOPSRCDIR = @top_srcdir@
 TOPOBJDIR = ../..
 SRCDIR    = @srcdir@
diff --git a/dlls/rpcrt4/rpc_binding.c b/dlls/rpcrt4/rpc_binding.c
index 412fe5908f7..72b2732b73e 100644
--- a/dlls/rpcrt4/rpc_binding.c
+++ b/dlls/rpcrt4/rpc_binding.c
@@ -1024,7 +1024,7 @@ RPC_STATUS WINAPI RpcBindingToStringBindingA( RPC_BINDING_HANDLE Binding, unsign
 /***********************************************************************
  *             RpcBindingToStringBindingW (RPCRT4.@)
  */
-RPC_STATUS WINAPI RpcBindingToStringBindingW( RPC_BINDING_HANDLE Binding, LPWSTR* StringBinding )
+RPC_STATUS WINAPI RpcBindingToStringBindingW( RPC_BINDING_HANDLE Binding, unsigned short** StringBinding )
 {
   RPC_STATUS ret;
   unsigned char *str = NULL;
diff --git a/dlls/rpcrt4/rpc_server.c b/dlls/rpcrt4/rpc_server.c
index cc99fcd2fcc..affd2784c71 100644
--- a/dlls/rpcrt4/rpc_server.c
+++ b/dlls/rpcrt4/rpc_server.c
@@ -992,7 +992,7 @@ RPC_STATUS WINAPI RpcMgmtStopServerListening ( RPC_BINDING_HANDLE Binding )
 /***********************************************************************
  *             I_RpcServerStartListening (RPCRT4.@)
  */
-RPC_STATUS WINAPI I_RpcServerStartListening( void* hWnd )
+RPC_STATUS WINAPI I_RpcServerStartListening( HWND hWnd )
 {
   FIXME( "(%p): stub\n", hWnd );