diff --git a/libs/vkd3d/device.c b/libs/vkd3d/device.c
index 45459ce5..f281d595 100644
--- a/libs/vkd3d/device.c
+++ b/libs/vkd3d/device.c
@@ -4055,7 +4055,7 @@ static void STDMETHODCALLTYPE d3d12_device_CopyDescriptorsSimple(d3d12_device_if
             iface, descriptor_count, dst_descriptor_range_offset.ptr, src_descriptor_range_offset.ptr,
             descriptor_heap_type);
 
-    device = impl_from_ID3D12Device(iface);
+    device = unsafe_impl_from_ID3D12Device(iface);
 
     if (descriptor_heap_type == D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV ||
             descriptor_heap_type == D3D12_DESCRIPTOR_HEAP_TYPE_SAMPLER)
diff --git a/libs/vkd3d/vkd3d_private.h b/libs/vkd3d/vkd3d_private.h
index 15d70fd9..7deb1a9c 100644
--- a/libs/vkd3d/vkd3d_private.h
+++ b/libs/vkd3d/vkd3d_private.h
@@ -2930,6 +2930,11 @@ bool d3d12_device_is_uma(struct d3d12_device *device, bool *coherent);
 void d3d12_device_mark_as_removed(struct d3d12_device *device, HRESULT reason,
         const char *message, ...) VKD3D_PRINTF_FUNC(3, 4);
 
+static inline struct d3d12_device *unsafe_impl_from_ID3D12Device(d3d12_device_iface *iface)
+{
+    return CONTAINING_RECORD(iface, struct d3d12_device, ID3D12Device_iface);
+}
+
 static inline struct d3d12_device *impl_from_ID3D12Device(d3d12_device_iface *iface)
 {
     extern CONST_VTBL struct ID3D12Device9Vtbl d3d12_device_vtbl;