diff --git a/Core/HLE/sceKernelTime.h b/Core/HLE/sceKernelTime.h
index 049ab1252ed3..f23a2f2aedc3 100644
--- a/Core/HLE/sceKernelTime.h
+++ b/Core/HLE/sceKernelTime.h
@@ -17,6 +17,11 @@
 
 #pragma once
 
+#include <cstdint>
+#include "Common/CommonTypes.h"
+
+#include "Common/Serialize/Serializer.h"
+
 u32 sceKernelLibcGettimeofday(u32 timeAddr, u32 tzAddr);
 u32 sceKernelLibcTime(u32 outPtr);
 int sceKernelUSec2SysClock(u32 microsec, u32 clockPtr);
diff --git a/Core/HLE/sceRtc.h b/Core/HLE/sceRtc.h
index 981343e1eb37..0ca1848e29c5 100644
--- a/Core/HLE/sceRtc.h
+++ b/Core/HLE/sceRtc.h
@@ -17,6 +17,8 @@
 
 #pragma once
 
+#include <cstdint>
+
 #include "Common/CommonTypes.h"
 #include "Common/Swap.h"