diff --git a/dlls/d3d10core/d3d10core_main.c b/dlls/d3d10core/d3d10core_main.c
index 273f15d6632..4151dd05336 100644
--- a/dlls/d3d10core/d3d10core_main.c
+++ b/dlls/d3d10core/d3d10core_main.c
@@ -81,13 +81,7 @@ static HRESULT WINAPI layer_create(enum dxgi_device_layer_id id, void **layer_ba
     }
 
     object = *layer_base;
-
-    object->vtbl = &d3d10_device_vtbl;
-    object->inner_unknown_vtbl = &d3d10_device_inner_unknown_vtbl;
-    object->device_parent_vtbl = &d3d10_wined3d_device_parent_vtbl;
-    object->refcount = 1;
-
-    object->outer_unknown = device_object;
+    d3d10_device_init(object, device_object);
     *device_layer = &object->inner_unknown_vtbl;
 
     TRACE("Created d3d10 device at %p\n", object);
diff --git a/dlls/d3d10core/d3d10core_private.h b/dlls/d3d10core/d3d10core_private.h
index f4535ce930d..35d5ed3e256 100644
--- a/dlls/d3d10core/d3d10core_private.h
+++ b/dlls/d3d10core/d3d10core_private.h
@@ -67,9 +67,6 @@ HRESULT parse_dxbc(const char *data, SIZE_T data_size,
         HRESULT (*chunk_handler)(const char *data, DWORD data_size, DWORD tag, void *ctx), void *ctx) DECLSPEC_HIDDEN;
 
 /* IDirect3D10Device */
-extern const struct ID3D10DeviceVtbl d3d10_device_vtbl DECLSPEC_HIDDEN;
-extern const struct IUnknownVtbl d3d10_device_inner_unknown_vtbl DECLSPEC_HIDDEN;
-extern const struct IWineD3DDeviceParentVtbl d3d10_wined3d_device_parent_vtbl DECLSPEC_HIDDEN;
 struct d3d10_device
 {
     const struct ID3D10DeviceVtbl *vtbl;
@@ -81,6 +78,8 @@ struct d3d10_device
     IWineD3DDevice *wined3d_device;
 };
 
+void d3d10_device_init(struct d3d10_device *device, void *outer_unknown) DECLSPEC_HIDDEN;
+
 /* ID3D10Texture2D */
 struct d3d10_texture2d
 {
diff --git a/dlls/d3d10core/device.c b/dlls/d3d10core/device.c
index b3da2ed4c00..4898a091aa7 100644
--- a/dlls/d3d10core/device.c
+++ b/dlls/d3d10core/device.c
@@ -1117,7 +1117,7 @@ static void STDMETHODCALLTYPE d3d10_device_GetTextFilterSize(ID3D10Device *iface
     FIXME("iface %p, width %p, height %p stub!\n", iface, width, height);
 }
 
-const struct ID3D10DeviceVtbl d3d10_device_vtbl =
+static const struct ID3D10DeviceVtbl d3d10_device_vtbl =
 {
     /* IUnknown methods */
     d3d10_device_QueryInterface,
@@ -1221,7 +1221,7 @@ const struct ID3D10DeviceVtbl d3d10_device_vtbl =
     d3d10_device_GetTextFilterSize,
 };
 
-const struct IUnknownVtbl d3d10_device_inner_unknown_vtbl =
+static const struct IUnknownVtbl d3d10_device_inner_unknown_vtbl =
 {
     /* IUnknown methods */
     d3d10_device_inner_QueryInterface,
@@ -1425,7 +1425,7 @@ static HRESULT STDMETHODCALLTYPE device_parent_CreateSwapChain(IWineD3DDevicePar
     return S_OK;
 }
 
-const struct IWineD3DDeviceParentVtbl d3d10_wined3d_device_parent_vtbl =
+static const struct IWineD3DDeviceParentVtbl d3d10_wined3d_device_parent_vtbl =
 {
     /* IUnknown methods */
     device_parent_QueryInterface,
@@ -1439,3 +1439,12 @@ const struct IWineD3DDeviceParentVtbl d3d10_wined3d_device_parent_vtbl =
     device_parent_CreateVolume,
     device_parent_CreateSwapChain,
 };
+
+void d3d10_device_init(struct d3d10_device *device, void *outer_unknown)
+{
+    device->vtbl = &d3d10_device_vtbl;
+    device->inner_unknown_vtbl = &d3d10_device_inner_unknown_vtbl;
+    device->device_parent_vtbl = &d3d10_wined3d_device_parent_vtbl;
+    device->refcount = 1;
+    device->outer_unknown = outer_unknown;
+}