diff --git a/dlls/wined3d/cubetexture.c b/dlls/wined3d/cubetexture.c
index ffd78b9f34e..a9fccac85b3 100644
--- a/dlls/wined3d/cubetexture.c
+++ b/dlls/wined3d/cubetexture.c
@@ -272,7 +272,7 @@ HRESULT WINAPI IWineD3DCubeTextureImpl_UnlockRect(IWineD3DCubeTexture *iface, D3
     IWineD3DCubeTextureImpl *This = (IWineD3DCubeTextureImpl *)iface;
 
     if (Level < This->baseTexture.levels) {
-        hr = IWineD3DSurface_UnlockRect((IWineD3DSurface *) This->surfaces[FaceType][Level]);
+        hr = IWineD3DSurface_UnlockRect(This->surfaces[FaceType][Level]);
     }
 
     if (D3D_OK == hr) {
diff --git a/dlls/wined3d/device.c b/dlls/wined3d/device.c
index 90c6878987e..d9bb39c2900 100644
--- a/dlls/wined3d/device.c
+++ b/dlls/wined3d/device.c
@@ -5148,7 +5148,7 @@ HRESULT  WINAPI  IWineD3DDeviceImpl_GetRenderTarget(IWineD3DDevice* iface,DWORD
     if(RenderTargetIndex > 0)
         FIXME("(%p) : RenderTargetIndex %ld >0 not currently supported\n", This, RenderTargetIndex);
 
-    *ppRenderTarget = (IWineD3DSurface *)This->renderTarget;
+    *ppRenderTarget = This->renderTarget;
     TRACE("(%p) : RenderTarget %ld Index returning %p\n", This, RenderTargetIndex, *ppRenderTarget);
     /* Note inc ref on returned surface */
     if(*ppRenderTarget != NULL)
@@ -5158,7 +5158,7 @@ HRESULT  WINAPI  IWineD3DDeviceImpl_GetRenderTarget(IWineD3DDevice* iface,DWORD
 
 HRESULT  WINAPI  IWineD3DDeviceImpl_GetDepthStencilSurface(IWineD3DDevice* iface, IWineD3DSurface **ppZStencilSurface) {
     IWineD3DDeviceImpl *This = (IWineD3DDeviceImpl *)iface;
-    *ppZStencilSurface = (IWineD3DSurface *)This->depthStencilBuffer;
+    *ppZStencilSurface = This->depthStencilBuffer;
     TRACE("(%p) : zStencilSurface  returning %p\n", This,  *ppZStencilSurface);
 
     if(*ppZStencilSurface != NULL) {
diff --git a/dlls/wined3d/surface.c b/dlls/wined3d/surface.c
index d242119c682..79358cc0e70 100644
--- a/dlls/wined3d/surface.c
+++ b/dlls/wined3d/surface.c
@@ -995,7 +995,7 @@ HRESULT WINAPI IWineD3DSurfaceImpl_LoadTexture(IWineD3DSurface *iface) {
             ++gen;
             if ((gen % 10) == 0) {
                 snprintf(buffer, sizeof(buffer), "/tmp/surface%p_type%u_level%u_%u.ppm", This, This->glDescription.target, This->glDescription.level, gen);
-                IWineD3DSurfaceImpl_SaveSnapshot((IWineD3DSurface *) This, buffer);
+                IWineD3DSurfaceImpl_SaveSnapshot(iface, buffer);
             }
             /*
              * debugging crash code
diff --git a/dlls/wined3d/swapchain.c b/dlls/wined3d/swapchain.c
index 7a526bbef92..42d2a99c2d3 100644
--- a/dlls/wined3d/swapchain.c
+++ b/dlls/wined3d/swapchain.c
@@ -226,7 +226,7 @@ HRESULT WINAPI IWineD3DSwapChainImpl_Present(IWineD3DSwapChain *iface, CONST REC
                 checkGLcall("glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);");
 
                 /* If this swapchain is currently the active context then make this swapchain active */
-                if(IWineD3DSurface_GetContainer((IWineD3DSurface *)This->wineD3DDevice->renderTarget, &IID_IWineD3DSwapChain, (void **)&tmp) == D3D_OK){
+                if(IWineD3DSurface_GetContainer(This->wineD3DDevice->renderTarget, &IID_IWineD3DSwapChain, (void **)&tmp) == D3D_OK){
                     if(tmp != (IUnknown *)This){
                         glXMakeCurrent(This->display, currentDrawable, currentContext);
                         checkGLcall("glXMakeCurrent");
@@ -346,7 +346,7 @@ HRESULT WINAPI IWineD3DSwapChainImpl_GetBackBuffer(IWineD3DSwapChain *iface, UIN
 
     IWineD3DSwapChainImpl *This = (IWineD3DSwapChainImpl *)iface;
 
-    *ppBackBuffer = (IWineD3DSurface *) This->backBuffer;
+    *ppBackBuffer = This->backBuffer;
     TRACE("(%p) : BackBuf %d Type %d  returning %p\n", This, iBackBuffer, Type, *ppBackBuffer);
 
     if (iBackBuffer > This->presentParms.BackBufferCount - 1) {
diff --git a/dlls/wined3d/texture.c b/dlls/wined3d/texture.c
index b14064c5238..8acd0838c41 100644
--- a/dlls/wined3d/texture.c
+++ b/dlls/wined3d/texture.c
@@ -208,7 +208,7 @@ HRESULT WINAPI IWineD3DTextureImpl_GetLevelDesc(IWineD3DTexture *iface, UINT Lev
 
     if (Level < This->baseTexture.levels) {
         TRACE("(%p) Level (%d)\n", This, Level);
-        return IWineD3DSurface_GetDesc((IWineD3DSurface *) This->surfaces[Level], pDesc);
+        return IWineD3DSurface_GetDesc(This->surfaces[Level], pDesc);
     }
     FIXME("(%p) level(%d) overflow Levels(%d)\n", This, Level, This->baseTexture.levels);
     return D3DERR_INVALIDCALL;
@@ -237,7 +237,7 @@ HRESULT WINAPI IWineD3DTextureImpl_LockRect(IWineD3DTexture *iface, UINT Level,
     HRESULT hr = D3DERR_INVALIDCALL;
 
     if (Level < This->baseTexture.levels) {
-        hr = IWineD3DSurface_LockRect((IWineD3DSurface *) This->surfaces[Level], pLockedRect, pRect, Flags);
+        hr = IWineD3DSurface_LockRect(This->surfaces[Level], pLockedRect, pRect, Flags);
     }
     if (D3D_OK == hr) {
         TRACE("(%p) Level (%d) success\n", This, Level);
@@ -267,7 +267,7 @@ HRESULT WINAPI IWineD3DTextureImpl_AddDirtyRect(IWineD3DTexture *iface, CONST RE
     IWineD3DTextureImpl *This = (IWineD3DTextureImpl *)iface;
     This->baseTexture.dirty = TRUE;
     TRACE("(%p) : dirtyfication of surface Level (0)\n", This);
-    return IWineD3DSurface_AddDirtyRect((IWineD3DSurface *)This->surfaces[0], pDirtyRect);
+    return IWineD3DSurface_AddDirtyRect(This->surfaces[0], pDirtyRect);
 }
 
 const IWineD3DTextureVtbl IWineD3DTexture_Vtbl =
diff --git a/dlls/wined3d/volumetexture.c b/dlls/wined3d/volumetexture.c
index 2204c889f1a..0e8d9cd5afb 100644
--- a/dlls/wined3d/volumetexture.c
+++ b/dlls/wined3d/volumetexture.c
@@ -60,7 +60,7 @@ ULONG WINAPI IWineD3DVolumeTextureImpl_Release(IWineD3DVolumeTexture *iface) {
         for (i = 0; i < This->baseTexture.levels; i++) {
             if (This->volumes[i] != NULL) {
                 TRACE("(%p) : Releasing volume %p\n", This, This->volumes[i]);
-                IWineD3DVolume_Release((IWineD3DSurface *) This->volumes[i]);
+                IWineD3DVolume_Release(This->volumes[i]);
             }
         }
         IWineD3DBaseTextureImpl_CleanUp((IWineD3DBaseTexture *) iface);