diff --git a/reactos/lib/msvcrt/misc/getargs.c b/reactos/lib/msvcrt/misc/getargs.c
index 498f6d6d2e0..f969bd152bf 100644
--- a/reactos/lib/msvcrt/misc/getargs.c
+++ b/reactos/lib/msvcrt/misc/getargs.c
@@ -4,6 +4,7 @@
 
 extern char *_acmdln;
 extern char *_pgmptr;
+#undef _environ
 extern char **_environ;
 
 #undef __argv