diff --git a/src/core/hle/service/set/appln_settings.h b/src/core/hle/service/set/appln_settings.h
index b07df0ee7..126375860 100644
--- a/src/core/hle/service/set/appln_settings.h
+++ b/src/core/hle/service/set/appln_settings.h
@@ -4,6 +4,7 @@
 #pragma once
 
 #include <array>
+#include <cstddef>
 
 #include "common/common_types.h"
 
diff --git a/src/core/hle/service/set/device_settings.h b/src/core/hle/service/set/device_settings.h
index b6cfe04f2..f291d0ebe 100644
--- a/src/core/hle/service/set/device_settings.h
+++ b/src/core/hle/service/set/device_settings.h
@@ -4,6 +4,7 @@
 #pragma once
 
 #include <array>
+#include <cstddef>
 
 #include "common/common_types.h"