diff --git a/ddclient.in b/ddclient.in
index e3827f8..c3fdded 100755
--- a/ddclient.in
+++ b/ddclient.in
@@ -1325,7 +1325,7 @@ sub main {
               $opt{'use'}, join("\n", ip_strategies_usage()))
             if defined(opt('use')) && !$ip_strategies{lc(opt('use'))};
         if (defined($opt{'usev6'})) {
-            usage("invalid argument '--usev6=%s'; possible values are:\n%s",
+            fatal("invalid argument '--usev6=%s'; possible values are:\n%s",
                   $opt{'usev6'}, join("\n", ipv6_strategies_usage()))
                 unless exists $ipv6_strategies{lc opt('usev6')};
         }