diff --git a/appl/telnet/libtelnet/misc.c b/appl/telnet/libtelnet/misc.c
index 7f2c82cfa..a5a14e000 100644
--- a/appl/telnet/libtelnet/misc.c
+++ b/appl/telnet/libtelnet/misc.c
@@ -71,7 +71,7 @@ auth_encrypt_init(const char *local, const char *remote, const char *name,
 }
 
 void
-auth_encrypt_user(char *name)
+auth_encrypt_user(const char *name)
 {
     if (UserNameRequested)
 	free(UserNameRequested);