diff --git a/reactos/lib/rpcrt4/cproxy.c b/reactos/lib/rpcrt4/cproxy.c
index c36baf94558..10639cbfedf 100644
--- a/reactos/lib/rpcrt4/cproxy.c
+++ b/reactos/lib/rpcrt4/cproxy.c
@@ -41,7 +41,7 @@ struct StublessThunk;
 /* I don't know what MS's std proxy structure looks like,
    so this probably doesn't match, but that shouldn't matter */
 typedef struct {
-  ICOM_VTABLE(IRpcProxyBuffer) *lpVtbl;
+  IRpcProxyBufferVtbl *lpVtbl;
   LPVOID *PVtbl;
   DWORD RefCount;
   const MIDL_STUBLESS_PROXY_INFO *stubless;
@@ -53,7 +53,9 @@ typedef struct {
   struct StublessThunk *thunks;
 } StdProxyImpl;
 
-static ICOM_VTABLE(IRpcProxyBuffer) StdProxy_Vtbl;
+static IRpcProxyBufferVtbl StdProxy_Vtbl;
+
+#define ICOM_THIS_MULTI(impl,field,iface) impl* const This=(impl*)((char*)(iface) - offsetof(impl,field))
 
 /* How the Windows stubless proxy thunks work is explained at
  * http://msdn.microsoft.com/library/en-us/dnmsj99/html/com0199.asp,
@@ -265,7 +267,7 @@ static VOID WINAPI StdProxy_Disconnect(LPRPCPROXYBUFFER iface)
   This->pChannel = NULL;
 }
 
-static ICOM_VTABLE(IRpcProxyBuffer) StdProxy_Vtbl =
+static IRpcProxyBufferVtbl StdProxy_Vtbl =
 {
   ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
   StdProxy_QueryInterface,
diff --git a/reactos/lib/rpcrt4/cpsf.c b/reactos/lib/rpcrt4/cpsf.c
index ba0db037e29..136232073e3 100644
--- a/reactos/lib/rpcrt4/cpsf.c
+++ b/reactos/lib/rpcrt4/cpsf.c
@@ -114,7 +114,7 @@ static HRESULT WINAPI CStdPSFactory_CreateStub(LPPSFACTORYBUFFER iface,
                                   ProxyInfo->pStubVtblList[Index], iface, ppStub);
 }
 
-static ICOM_VTABLE(IPSFactoryBuffer) CStdPSFactory_Vtbl =
+static IPSFactoryBufferVtbl CStdPSFactory_Vtbl =
 {
   ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
   CStdPSFactory_QueryInterface,
diff --git a/reactos/lib/rpcrt4/ndr_ole.c b/reactos/lib/rpcrt4/ndr_ole.c
index 26ddb25c56e..0a43712370d 100644
--- a/reactos/lib/rpcrt4/ndr_ole.c
+++ b/reactos/lib/rpcrt4/ndr_ole.c
@@ -77,7 +77,7 @@ static HMODULE LoadCOM(void)
  * (which also implements the MInterfacePointer structure) */
 typedef struct RpcStreamImpl
 {
-  ICOM_VFIELD(IStream);
+  IStreamVtbl *lpVtbl;
   DWORD RefCount;
   PMIDL_STUB_MESSAGE pMsg;
   LPDWORD size;
@@ -180,7 +180,7 @@ static HRESULT WINAPI RpcStream_SetSize(LPSTREAM iface,
   return S_OK;
 }
 
-static ICOM_VTABLE(IStream) RpcStream_Vtbl =
+static IStreamVtbl RpcStream_Vtbl =
 {
   ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
   RpcStream_QueryInterface,