diff --git a/tests/d3d12.c b/tests/d3d12.c
index a37fab7a..3297333d 100644
--- a/tests/d3d12.c
+++ b/tests/d3d12.c
@@ -18,11 +18,6 @@
 
 #define VKD3D_DBG_CHANNEL VKD3D_DBG_CHANNEL_API
 
-#ifdef _MSC_VER
-/* Used for M_PI */
-#define _USE_MATH_DEFINES
-#endif
-
 #include "d3d12_crosstest.h"
 
 PFN_D3D12_CREATE_VERSIONED_ROOT_SIGNATURE_DESERIALIZER pfn_D3D12CreateVersionedRootSignatureDeserializer;
diff --git a/tests/d3d12_crosstest.h b/tests/d3d12_crosstest.h
index 6faa71bf..e6769b1f 100644
--- a/tests/d3d12_crosstest.h
+++ b/tests/d3d12_crosstest.h
@@ -19,6 +19,11 @@
 #ifndef __VKD3D_D3D12_CROSSTEST_H
 #define __VKD3D_D3D12_CROSSTEST_H
 
+#ifdef _MSC_VER
+/* Used for M_PI */
+#define _USE_MATH_DEFINES
+#endif
+
 #ifdef _WIN32
 # include <vkd3d_win32.h>
 #endif