Small change not to #include <vulkan/vulkan.h> if it was already included (possible from a different path) before including VMA. Issue #50 Thanks @baldurk !
diff --git a/src/VmaUsage.h b/src/VmaUsage.h
index bd31938..9d24b96 100644
--- a/src/VmaUsage.h
+++ b/src/VmaUsage.h
@@ -8,7 +8,8 @@
#include <Windows.h>
#define VK_USE_PLATFORM_WIN32_KHR
-#include <vulkan/vulkan.h>
+// Uncomment to test including `vulkan.h` on your own before including VMA.
+//#include <vulkan/vulkan.h>
/*
In every place where you want to use Vulkan Memory Allocator, define appropriate
diff --git a/src/vk_mem_alloc.h b/src/vk_mem_alloc.h
index 56b2624..310a4b1 100644
--- a/src/vk_mem_alloc.h
+++ b/src/vk_mem_alloc.h
@@ -1492,7 +1492,9 @@
#define NOMINMAX // For windows.h
#endif
-#include <vulkan/vulkan.h>
+#ifndef VULKAN_H_
+ #include <vulkan/vulkan.h>
+#endif
#if VMA_RECORDING_ENABLED
#include <windows.h>
