diff --git a/Source/Core/Common/Arm64Emitter.h b/Source/Core/Common/Arm64Emitter.h
index 62c0d6347d..b94e306612 100644
--- a/Source/Core/Common/Arm64Emitter.h
+++ b/Source/Core/Common/Arm64Emitter.h
@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include <functional>
+
 #include "Common/ArmCommon.h"
 #include "Common/BitSet.h"
 #include "Common/CodeBlock.h"