diff --git a/dlls/d3d8/cubetexture.c b/dlls/d3d8/cubetexture.c
index 891042edea4..1ecf47c8b0a 100644
--- a/dlls/d3d8/cubetexture.c
+++ b/dlls/d3d8/cubetexture.c
@@ -330,17 +330,21 @@ static HRESULT WINAPI IDirect3DCubeTexture8Impl_LockRect(IDirect3DCubeTexture8 *
 }
 
 static HRESULT WINAPI IDirect3DCubeTexture8Impl_UnlockRect(IDirect3DCubeTexture8 *iface,
-        D3DCUBEMAP_FACES FaceType, UINT Level)
+        D3DCUBEMAP_FACES face, UINT level)
 {
-    IDirect3DCubeTexture8Impl *This = impl_from_IDirect3DCubeTexture8(iface);
+    IDirect3DCubeTexture8Impl *texture = impl_from_IDirect3DCubeTexture8(iface);
+    struct wined3d_resource *sub_resource;
     UINT sub_resource_idx;
     HRESULT hr;
 
-    TRACE("iface %p, face %#x, level %u.\n", iface, FaceType, Level);
+    TRACE("iface %p, face %#x, level %u.\n", iface, face, level);
 
     wined3d_mutex_lock();
-    sub_resource_idx = IWineD3DCubeTexture_GetLevelCount(This->wineD3DCubeTexture) * FaceType + Level;
-    hr = IWineD3DCubeTexture_Unmap(This->wineD3DCubeTexture, sub_resource_idx);
+    sub_resource_idx = IWineD3DCubeTexture_GetLevelCount(texture->wineD3DCubeTexture) * face + level;
+    if (!(sub_resource = IWineD3DCubeTexture_GetSubResource(texture->wineD3DCubeTexture, sub_resource_idx)))
+        hr = D3DERR_INVALIDCALL;
+    else
+        hr = IDirect3DSurface8_UnlockRect((IDirect3DSurface8 *)wined3d_resource_get_parent(sub_resource));
     wined3d_mutex_unlock();
 
     return hr;
diff --git a/dlls/d3d9/cubetexture.c b/dlls/d3d9/cubetexture.c
index 87d00c191ce..798ffc9ced4 100644
--- a/dlls/d3d9/cubetexture.c
+++ b/dlls/d3d9/cubetexture.c
@@ -345,17 +345,21 @@ static HRESULT WINAPI IDirect3DCubeTexture9Impl_LockRect(IDirect3DCubeTexture9 *
 }
 
 static HRESULT WINAPI IDirect3DCubeTexture9Impl_UnlockRect(IDirect3DCubeTexture9 *iface,
-        D3DCUBEMAP_FACES FaceType, UINT Level)
+        D3DCUBEMAP_FACES face, UINT level)
 {
-    IDirect3DCubeTexture9Impl *This = (IDirect3DCubeTexture9Impl *)iface;
+    IDirect3DCubeTexture9Impl *texture = (IDirect3DCubeTexture9Impl *)iface;
+    struct wined3d_resource *sub_resource;
     UINT sub_resource_idx;
     HRESULT hr;
 
-    TRACE("iface %p, face %#x, level %u.\n", iface, FaceType, Level);
+    TRACE("iface %p, face %#x, level %u.\n", iface, face, level);
 
     wined3d_mutex_lock();
-    sub_resource_idx = IWineD3DCubeTexture_GetLevelCount(This->wineD3DCubeTexture) * FaceType + Level;
-    hr = IWineD3DCubeTexture_Unmap(This->wineD3DCubeTexture, sub_resource_idx);
+    sub_resource_idx = IWineD3DCubeTexture_GetLevelCount(texture->wineD3DCubeTexture) * face + level;
+    if (!(sub_resource = IWineD3DCubeTexture_GetSubResource(texture->wineD3DCubeTexture, sub_resource_idx)))
+        hr = D3DERR_INVALIDCALL;
+    else
+        hr = IDirect3DSurface9_UnlockRect((IDirect3DSurface9 *)wined3d_resource_get_parent(sub_resource));
     wined3d_mutex_unlock();
 
     return hr;
diff --git a/dlls/wined3d/cubetexture.c b/dlls/wined3d/cubetexture.c
index b5294ddd0d2..db5cbd3a2f8 100644
--- a/dlls/wined3d/cubetexture.c
+++ b/dlls/wined3d/cubetexture.c
@@ -336,24 +336,6 @@ static struct wined3d_resource * WINAPI IWineD3DCubeTextureImpl_GetSubResource(I
     return basetexture_get_sub_resource(texture, sub_resource_idx);
 }
 
-static HRESULT WINAPI IWineD3DCubeTextureImpl_Unmap(IWineD3DCubeTexture *iface,
-        UINT sub_resource_idx)
-{
-    IWineD3DBaseTextureImpl *texture = (IWineD3DBaseTextureImpl *)iface;
-    struct wined3d_resource *sub_resource;
-
-    TRACE("iface %p, sub_resource_idx %u.\n",
-            iface, sub_resource_idx);
-
-    if (!(sub_resource = basetexture_get_sub_resource(texture, sub_resource_idx)))
-    {
-        WARN("Failed to get sub-resource.\n");
-        return WINED3DERR_INVALIDCALL;
-    }
-
-    return IWineD3DSurface_Unmap((IWineD3DSurface *)surface_from_resource(sub_resource));
-}
-
 static HRESULT WINAPI IWineD3DCubeTextureImpl_AddDirtyRect(IWineD3DCubeTexture *iface,
         WINED3DCUBEMAP_FACES face, const RECT *dirty_rect)
 {
@@ -401,7 +383,6 @@ static const IWineD3DCubeTextureVtbl IWineD3DCubeTexture_Vtbl =
     IWineD3DCubeTextureImpl_IsCondNP2,
     IWineD3DCubeTextureImpl_GetSubResource,
     /* IWineD3DCubeTexture */
-    IWineD3DCubeTextureImpl_Unmap,
     IWineD3DCubeTextureImpl_AddDirtyRect
 };
 
diff --git a/include/wine/wined3d.idl b/include/wine/wined3d.idl
index 83e0479651d..78270806329 100644
--- a/include/wine/wined3d.idl
+++ b/include/wine/wined3d.idl
@@ -2382,9 +2382,6 @@ interface IWineD3DTexture : IWineD3DBaseTexture
 ]
 interface IWineD3DCubeTexture : IWineD3DBaseTexture
 {
-    HRESULT Unmap(
-        [in] UINT sub_resource_idx
-    );
     HRESULT AddDirtyRect(
         [in] WINED3DCUBEMAP_FACES face,
         [in] const RECT *dirty_rect