diff --git a/dlls/dxgi/tests/device.c b/dlls/dxgi/tests/device.c
index 32e87e6..41e872e 100644
--- a/dlls/dxgi/tests/device.c
+++ b/dlls/dxgi/tests/device.c
@@ -22,7 +22,7 @@
 #include "wine/test.h"
 
 HRESULT WINAPI DXGID3D10CreateDevice(HMODULE d3d10core, IDXGIFactory *factory,
-        IDXGIAdapter *adapter, UINT flags, DWORD arg5, void **device);
+        IDXGIAdapter *adapter, UINT flags, DWORD_PTR arg5, void **device);
 
 static IDXGIDevice *create_device(HMODULE d3d10core)
 {