diff --git a/src/VmaReplay/VmaUsage.h b/src/VmaReplay/VmaUsage.h
index 22ba27e..a2d2e97 100644
--- a/src/VmaReplay/VmaUsage.h
+++ b/src/VmaReplay/VmaUsage.h
@@ -26,7 +26,9 @@
 #define WIN32_LEAN_AND_MEAN
 #include <Windows.h>
 
-#define VK_USE_PLATFORM_WIN32_KHR
+#if !defined(VK_USE_PLATFORM_WIN32_KHR)
+    #define VK_USE_PLATFORM_WIN32_KHR
+#endif // #if !defined(VK_USE_PLATFORM_WIN32_KHR)
 #include <vulkan/vulkan.h>
 
 //#define VMA_USE_STL_CONTAINERS 1
diff --git a/src/VmaUsage.h b/src/VmaUsage.h
index 52c0513..10714e7 100644
--- a/src/VmaUsage.h
+++ b/src/VmaUsage.h
@@ -28,7 +28,9 @@
 #define NOMINMAX
 #define WIN32_LEAN_AND_MEAN
 #include <Windows.h>
-#define VK_USE_PLATFORM_WIN32_KHR
+#if !defined(VK_USE_PLATFORM_WIN32_KHR)
+    #define VK_USE_PLATFORM_WIN32_KHR
+#endif // #if !defined(VK_USE_PLATFORM_WIN32_KHR)
 
 #else  // #ifdef _WIN32