diff --git a/demos/demo.h b/demos/demo.h
index 2869ea7b..b2b93172 100644
--- a/demos/demo.h
+++ b/demos/demo.h
@@ -141,7 +141,6 @@ static inline HRESULT demo_create_root_signature(ID3D12Device *device,
 #ifdef _WIN32
 #include "demo_win32.h"
 #else
-#include <vkd3d_utils.h>
 #define INFINITE VKD3D_INFINITE
 #include "demo_xcb.h"
 #endif
diff --git a/demos/demo_xcb.h b/demos/demo_xcb.h
index 40e25340..6fae7909 100644
--- a/demos/demo_xcb.h
+++ b/demos/demo_xcb.h
@@ -19,6 +19,7 @@
 
 #define VK_USE_PLATFORM_XCB_KHR
 #include <vkd3d.h>
+#include <vkd3d_utils.h>
 #include <xcb/xcb_event.h>
 #include <xcb/xcb_icccm.h>
 #include <xcb/xcb_keysyms.h>
diff --git a/include/vkd3d_utils.h b/include/vkd3d_utils.h
index 8a5689a8..4a5ee5dd 100644
--- a/include/vkd3d_utils.h
+++ b/include/vkd3d_utils.h
@@ -19,6 +19,8 @@
 #ifndef __VKD3D_UTILS_H
 #define __VKD3D_UTILS_H
 
+#include <vkd3d.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif  /* __cplusplus */
@@ -34,6 +36,18 @@ HRESULT vkd3d_signal_event(HANDLE event);
 unsigned int vkd3d_wait_event(HANDLE event, unsigned int milliseconds);
 void vkd3d_destroy_event(HANDLE event);
 
+HRESULT WINAPI D3D12CreateDevice(IUnknown *adapter, D3D_FEATURE_LEVEL feature_level, REFIID iid, void **device);
+HRESULT WINAPI D3D12CreateRootSignatureDeserializer(const void *data, SIZE_T data_size, REFIID iid, void **deserializer);
+HRESULT WINAPI D3D12GetDebugInterface(REFIID iid, void **debug);
+HRESULT WINAPI D3D12SerializeRootSignature(const D3D12_ROOT_SIGNATURE_DESC *desc,
+        D3D_ROOT_SIGNATURE_VERSION version, ID3DBlob **blob, ID3DBlob **error_blob);
+
+/* 1.2 */
+HRESULT WINAPI D3D12CreateVersionedRootSignatureDeserializer(const void *data,
+        SIZE_T data_size, REFIID iid, void **deserializer);
+HRESULT WINAPI D3D12SerializeVersionedRootSignature(const D3D12_VERSIONED_ROOT_SIGNATURE_DESC *desc,
+        ID3DBlob **blob, ID3DBlob **error_blob);
+
 #ifdef __cplusplus
 }
 #endif  /* __cplusplus */