diff --git a/dll/directx/wine/d3dx9_36/effect.c b/dll/directx/wine/d3dx9_36/effect.c
index e8ae7b5..3538b15 100644
--- a/dll/directx/wine/d3dx9_36/effect.c
+++ b/dll/directx/wine/d3dx9_36/effect.c
@@ -4555,7 +4555,9 @@ static HRESULT WINAPI ID3DXEffectImpl_CloneEffect(ID3DXEffect *iface,
     if (!device)
         return D3DERR_INVALIDCALL;
 
-    return E_NOTIMPL;
+    iface->lpVtbl->AddRef(iface);
+    *effect = iface;
+    return S_OK;
 }
 
 #if D3DX_SDK_VERSION >= 27