diff --git a/src/rendering/vulkan/renderer/vk_postprocess.h b/src/rendering/vulkan/renderer/vk_postprocess.h
index 2a4dec4df..e758cbc6f 100644
--- a/src/rendering/vulkan/renderer/vk_postprocess.h
+++ b/src/rendering/vulkan/renderer/vk_postprocess.h
@@ -1,6 +1,8 @@
 
 #pragma once
 
+#include <functional>
+
 #include "vulkan/system/vk_objects.h"
 
 class FString;