1 files changed, 2 insertions, 2 deletions

diff --git a/auth-options.c b/auth-options.c
index b528c197a..ef57ebf43 100644
--- a/auth-options.c
+++ b/auth-options.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: auth-options.c,v 1.78 2018/03/14 05:35:40 djm Exp $ */
+/* $OpenBSD: auth-options.c,v 1.79 2018/04/06 04:15:45 djm Exp $ */
 /*
  * Copyright (c) 2018 Damien Miller <djm@mindrot.org>
  *
@@ -394,7 +394,7 @@ sshauthopt_parse(const char *opts, const char **errstrp)
                                 goto fail;
                         }
                         for (cp = opt; cp < tmp; cp++) {
-                                if (!isalnum((u_char)*cp)) {
+                                if (!isalnum((u_char)*cp) && *cp != '_') {
                                         free(opt);
                                         errstr = "invalid environment string";
                                         goto fail;