diff --git a/dlls/d3d8/device.c b/dlls/d3d8/device.c
index 8ddb0cb1f0b..dd0b9ee2e01 100644
--- a/dlls/d3d8/device.c
+++ b/dlls/d3d8/device.c
@@ -988,7 +988,6 @@ static HRESULT WINAPI d3d8_device_CopyRects(IDirect3DDevice8 *iface,
     struct wined3d_resource_desc wined3d_desc;
     struct wined3d_resource *wined3d_resource;
     UINT src_w, src_h;
-    HRESULT hr;
 
     TRACE("iface %p, src_surface %p, src_rects %p, rect_count %u, dst_surface %p, dst_points %p.\n",
             iface, src_surface, src_rects, rect_count, dst_surface, dst_points);
@@ -1020,24 +1019,13 @@ static HRESULT WINAPI d3d8_device_CopyRects(IDirect3DDevice8 *iface,
     dst_format = wined3d_desc.format;
 
     /* Check that the source and destination formats match */
-    if (src_format != dst_format && WINED3DFMT_UNKNOWN != dst_format)
+    if (src_format != dst_format)
     {
         WARN("Source %p format must match the destination %p format, returning D3DERR_INVALIDCALL.\n",
                 src_surface, dst_surface);
         wined3d_mutex_unlock();
         return D3DERR_INVALIDCALL;
     }
-    else if (WINED3DFMT_UNKNOWN == dst_format)
-    {
-        TRACE("Converting destination surface from WINED3DFMT_UNKNOWN to the source format.\n");
-        if (FAILED(hr = wined3d_surface_update_desc(dst->wined3d_surface, wined3d_desc.width, wined3d_desc.height,
-                src_format, wined3d_desc.multisample_type, wined3d_desc.multisample_quality, NULL, 0)))
-        {
-            WARN("Failed to update surface desc, hr %#x.\n", hr);
-            wined3d_mutex_unlock();
-            return hr;
-        }
-    }
 
     /* Quick if complete copy ... */
     if (!rect_count && !src_rects && !dst_points)