diff --git a/Common/x64Emitter.h b/Common/x64Emitter.h
index 5f3e27ebc0..1addb32e38 100644
--- a/Common/x64Emitter.h
+++ b/Common/x64Emitter.h
@@ -20,6 +20,7 @@
 
 #include "ppsspp_config.h"
 
+#include <cstddef>
 #include "Common.h"
 #include "CodeBlock.h"
 
diff --git a/Core/MIPS/MIPS.h b/Core/MIPS/MIPS.h
index ccb95c471d..c935783b40 100644
--- a/Core/MIPS/MIPS.h
+++ b/Core/MIPS/MIPS.h
@@ -17,6 +17,8 @@
 
 #pragma once
 
+#include <cstddef>
+
 #include "util/random/rng.h"
 #include "Common/CommonTypes.h"
 // #include "Core/CoreParameter.h"