diff --git a/src/codegen_new/codegen_backend_x86-64.c b/src/codegen_new/codegen_backend_x86-64.c
index 7c3e4f39a..02bcf2ab3 100644
--- a/src/codegen_new/codegen_backend_x86-64.c
+++ b/src/codegen_new/codegen_backend_x86-64.c
@@ -1,5 +1,6 @@
 #if defined __amd64__ || defined _M_X64
 
+#include <stdlib.h>
 #include <stdint.h>
 #include <86box/86box.h>
 #include "cpu.h"