diff --git a/src/core/hle/kernel/kernel.h b/src/core/hle/kernel/kernel.h
index 3a6db0b1ce..901d43da9c 100644
--- a/src/core/hle/kernel/kernel.h
+++ b/src/core/hle/kernel/kernel.h
@@ -5,6 +5,7 @@
 #pragma once
 
 #include <array>
+#include <functional>
 #include <memory>
 #include <string>
 #include <unordered_map>