diff --git a/rpcs3/Emu/RSX/Common/simple_array.hpp b/rpcs3/Emu/RSX/Common/simple_array.hpp
index 6650fb06d3..cc2f25a2cb 100644
--- a/rpcs3/Emu/RSX/Common/simple_array.hpp
+++ b/rpcs3/Emu/RSX/Common/simple_array.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <util/types.hpp>
+#include <functional>
 
 namespace rsx
 {