diff --git a/clipper.c b/clipper.c
index 7497ef4..f959997 100644
--- a/clipper.c
+++ b/clipper.c
@@ -18,19 +18,14 @@
 #include <stdio.h>
 #include "clipper.h"
 
-/* from main */
-HRESULT null();
-
-HRESULT ddraw_clipper_QueryInterface(void *This, REFIID riid, void **obj)
+HRESULT __stdcall ddraw_clipper_QueryInterface(IDirectDrawClipperImpl *This, REFIID riid, void **obj)
 {
     printf("DirectDrawClipper::QueryInterface(This=%p, riid=%08X, obj=%p)\n", This, (unsigned int)riid, obj);
     return S_OK;
 }
 
-ULONG ddraw_clipper_AddRef(void *_This)
+ULONG __stdcall ddraw_clipper_AddRef(IDirectDrawClipperImpl *This)
 {
-    fakeDirectDrawClipperObject *This = (fakeDirectDrawClipperObject *)_This;
-
     printf("DirectDrawClipper::AddRef(This=%p)\n", This);
 
     This->Ref++;
@@ -38,10 +33,8 @@ ULONG ddraw_clipper_AddRef(void *_This)
     return This->Ref;
 }
 
-ULONG ddraw_clipper_Release(void *_This)
+ULONG __stdcall ddraw_clipper_Release(IDirectDrawClipperImpl *This)
 {
-    fakeDirectDrawClipperObject *This = (fakeDirectDrawClipperObject *)_This;
-
     printf("DirectDrawClipper::Release(This=%p)\n", This);
 
     This->Ref--;
@@ -55,27 +48,63 @@ ULONG ddraw_clipper_Release(void *_This)
     return This->Ref;
 }
 
-fakeDirectDrawClipper ciface =
+HRESULT __stdcall ddraw_clipper_GetClipList(IDirectDrawClipperImpl *This, LPRECT a, LPRGNDATA b, LPDWORD c)
+{
+    printf("IDirectDrawClipper::GetClipList(This=%p, ...)\n", This);
+    return DD_OK;
+}
+
+HRESULT __stdcall ddraw_clipper_GetHWnd(IDirectDrawClipperImpl *This, HWND FAR *a)
+{
+    printf("IDirectDrawClipper::GetHWnd(This=%p, ...)\n", This);
+    return DD_OK;
+}
+
+HRESULT __stdcall ddraw_clipper_Initialize(IDirectDrawClipperImpl *This, LPDIRECTDRAW a, DWORD b)
+{
+    printf("IDirectDrawClipper::Initialize(This=%p, ...)\n", This);
+    return DD_OK;
+}
+
+HRESULT __stdcall ddraw_clipper_IsClipListChanged(IDirectDrawClipperImpl *This, BOOL FAR *a)
+{
+    printf("IDirectDrawClipper::IsClipListChanged(This=%p, ...)\n", This);
+    return DD_OK;
+}
+
+HRESULT __stdcall ddraw_clipper_SetClipList(IDirectDrawClipperImpl *This, LPRGNDATA a, DWORD b)
+{
+    printf("IDirectDrawClipper::SetClipList(This=%p, ...)\n", This);
+    return DD_OK;
+}
+
+HRESULT __stdcall ddraw_clipper_SetHWnd(IDirectDrawClipperImpl *This, DWORD a, HWND b)
+{
+    printf("IDirectDrawClipper::SetHWnd(This=%p, ...)\n", This);
+    return DD_OK;
+}
+
+struct IDirectDrawClipperImplVtbl ciface =
 {
     /* IUnknown */
     ddraw_clipper_QueryInterface,
     ddraw_clipper_AddRef,
     ddraw_clipper_Release,
     /* IDirectDrawClipper */
-    null, // ddraw_clipper_GetClipList
-    null, // ddraw_clipper_GetHWnd
-    null, // ddraw_clipper_Initialize
-    null, // ddraw_clipper_IsClipListChanged
-    null, // ddraw_clipper_SetClipList
-    null  // ddraw_clipper_SetHwnd
+    ddraw_clipper_GetClipList,
+    ddraw_clipper_GetHWnd,
+    ddraw_clipper_Initialize,
+    ddraw_clipper_IsClipListChanged,
+    ddraw_clipper_SetClipList,
+    ddraw_clipper_SetHWnd
 };
 
 HRESULT __stdcall ddraw_CreateClipper(IDirectDrawImpl *This, DWORD dwFlags, LPDIRECTDRAWCLIPPER FAR *lplpDDClipper, IUnknown FAR *pUnkOuter )
 {
     printf("DirectDraw::CreateClipper(This=%p, dwFlags=%d, DDClipper=%p, unkOuter=%p)\n", This, (int)dwFlags, lplpDDClipper, pUnkOuter);
 
-    fakeDirectDrawClipperObject *Clipper = (fakeDirectDrawClipperObject *)malloc(sizeof(fakeDirectDrawClipperObject));
-    Clipper->Functions = &ciface;
+    IDirectDrawClipperImpl *Clipper = (IDirectDrawClipperImpl *)HeapAlloc(GetProcessHeap(), 0, sizeof(IDirectDrawClipperImpl));
+    Clipper->lpVtbl = &ciface;
     printf(" Clipper = %p\n", Clipper);
     *lplpDDClipper = (LPDIRECTDRAWCLIPPER)Clipper;
 
diff --git a/clipper.h b/clipper.h
index c5458c3..503c6c4 100644
--- a/clipper.h
+++ b/clipper.h
@@ -21,32 +21,33 @@
 #include "ddraw.h"
 #include "main.h"
 
-typedef struct
-{
-    /* IUnknown */
-    HRESULT (*QueryInterface)(void *, REFIID, void **);
-    ULONG (*AddRef)(void *);
-    ULONG (*Release)(void *);
+HRESULT __stdcall ddraw_CreateClipper(IDirectDrawImpl *This, DWORD dwFlags, LPDIRECTDRAWCLIPPER FAR *lplpDDClipper, IUnknown FAR *pUnkOuter );
 
-    /* IDirectDrawClipper */
-    HRESULT (*GetClipList)(void *, LPRECT, LPRGNDATA, LPDWORD);
-    HRESULT (*GetHWnd)(void *, HWND FAR *);
-    HRESULT (*Initialize)(void *, LPDIRECTDRAW, DWORD);
-    HRESULT (*IsClipListChanged)(void *, BOOL FAR *);
-    HRESULT (*SetClipList)(void *, LPRGNDATA,DWORD);
-    HRESULT (*SetHWnd)(void *, DWORD, HWND );
-} fakeDirectDrawClipper;
+struct IDirectDrawClipperImpl;
+struct IDirectDrawClipperImplVtbl;
 
-typedef struct
+typedef struct IDirectDrawClipperImpl
 {
-    fakeDirectDrawClipper *Functions;
+    struct IDirectDrawClipperImplVtbl *lpVtbl;
 
     ULONG Ref;
 
-} fakeDirectDrawClipperObject;
+} IDirectDrawClipperImpl;
 
-extern fakeDirectDrawClipper ciface;
+struct IDirectDrawClipperImplVtbl
+{
+    /* IUnknown */
+    HRESULT __stdcall (*QueryInterface)(IDirectDrawClipperImpl *, REFIID, void **);
+    ULONG __stdcall (*AddRef)(IDirectDrawClipperImpl *);
+    ULONG __stdcall (*Release)(IDirectDrawClipperImpl *);
 
-HRESULT __stdcall ddraw_CreateClipper(IDirectDrawImpl *This, DWORD dwFlags, LPDIRECTDRAWCLIPPER FAR *lplpDDClipper, IUnknown FAR *pUnkOuter );
+    /* IDirectDrawClipper */
+    HRESULT __stdcall (*GetClipList)(IDirectDrawClipperImpl *, LPRECT, LPRGNDATA, LPDWORD);
+    HRESULT __stdcall (*GetHWnd)(IDirectDrawClipperImpl *, HWND FAR *);
+    HRESULT __stdcall (*Initialize)(IDirectDrawClipperImpl *, LPDIRECTDRAW, DWORD);
+    HRESULT __stdcall (*IsClipListChanged)(IDirectDrawClipperImpl *, BOOL FAR *);
+    HRESULT __stdcall (*SetClipList)(IDirectDrawClipperImpl *, LPRGNDATA,DWORD);
+    HRESULT __stdcall (*SetHWnd)(IDirectDrawClipperImpl *, DWORD, HWND );
+} IDirectDrawClipperImplVtbl;
 
 #endif
diff --git a/main.c b/main.c
index 8bf01e4..2265c64 100644
--- a/main.c
+++ b/main.c
@@ -209,13 +209,6 @@ ULONG __stdcall ddraw_Release(IDirectDrawImpl *This)
     return This->Ref;
 }
 
-HRESULT __stdcall null(void *This)
-{
-    printf("Warning: null method called for instance %p!\n", This);
-    fflush(NULL);
-    return DDERR_UNSUPPORTED;
-}
-
 struct IDirectDrawImplVtbl iface =
 {
     /* IUnknown */