diff --git a/reactos/tools/sysreg/env_var.cpp b/reactos/tools/sysreg/env_var.cpp
index 275e14c331e..219734d8146 100644
--- a/reactos/tools/sysreg/env_var.cpp
+++ b/reactos/tools/sysreg/env_var.cpp
@@ -10,6 +10,8 @@
 
 #include "env_var.h"
 #include <iostream>
+#include <cstdlib>
+#include <cstring>
 
 namespace System_
 {