diff --git a/auth-chall.c b/auth-chall.c
index b8b0c5d..9f5a151 100644
--- a/auth-chall.c
+++ b/auth-chall.c
@@ -34,7 +34,7 @@
 get_challenge(Authctxt *authctxt, char *devs)
 {
 	static char challenge[1024];
-        struct skey skey;
+	struct skey skey;
 	if (skeychallenge(&skey, authctxt->user, challenge) == -1)
 		return NULL;
 	strlcat(challenge, "\nS/Key Password: ", sizeof challenge);