diff --git a/Source/Core/InputCommon/ControllerInterface/ControllerInterface.h b/Source/Core/InputCommon/ControllerInterface/ControllerInterface.h
index d9d85cdd77..23afab7d67 100644
--- a/Source/Core/InputCommon/ControllerInterface/ControllerInterface.h
+++ b/Source/Core/InputCommon/ControllerInterface/ControllerInterface.h
@@ -5,6 +5,7 @@
 #pragma once
 
 #include <algorithm>
+#include <functional>
 #include <map>
 #include <sstream>
 #include <string>