diff --git a/FEXCore/Source/Common/StringConv.h b/FEXCore/Source/Common/StringConv.h
index e4b2dad1e..52ba07315 100644
--- a/FEXCore/Source/Common/StringConv.h
+++ b/FEXCore/Source/Common/StringConv.h
@@ -4,6 +4,7 @@
 
 #include <concepts>
 #include <string_view>
+#include <cstdlib>
 
 namespace FEXCore::StrConv {
 template<std::integral T>
diff --git a/Source/Windows/Common/CRT/Alloc.cpp b/Source/Windows/Common/CRT/Alloc.cpp
index 3d5f60de8..0e11be2fb 100644
--- a/Source/Windows/Common/CRT/Alloc.cpp
+++ b/Source/Windows/Common/CRT/Alloc.cpp
@@ -2,6 +2,7 @@
 #define _SECIMP
 #define _CRTIMP
 #include <cstdint>
+#include <cstdlib>
 #include "../Priv.h"
 #include <rpmalloc/rpmalloc.h>
 
diff --git a/Source/Windows/Common/CRT/IO.cpp b/Source/Windows/Common/CRT/IO.cpp
index 0f4704a74..8e41b4e1c 100644
--- a/Source/Windows/Common/CRT/IO.cpp
+++ b/Source/Windows/Common/CRT/IO.cpp
@@ -14,6 +14,7 @@ struct FILE;
 #include <cerrno>
 #include <io.h>
 #include <ctype.h>
+#include <stdarg.h>
 #include <wchar.h>
 #include <windef.h>
 #include <winternl.h>