diff --git a/CodeGen/src/CodeBlockUnwind.cpp b/CodeGen/src/CodeBlockUnwind.cpp
index 59ee6f13..3c2a3f84 100644
--- a/CodeGen/src/CodeBlockUnwind.cpp
+++ b/CodeGen/src/CodeBlockUnwind.cpp
@@ -5,6 +5,7 @@
 #include "Luau/UnwindBuilder.h"
 
 #include <string.h>
+#include <stdlib.h>
 
 #if defined(_WIN32) && defined(_M_X64)