1 files changed, 2 insertions, 5 deletions
diff --git a/src/or/router.c b/src/or/router.c
index 7d9d2724f7..f8aa1e3b05 100644
--- a/src/or/router.c
+++ b/src/or/router.c
@@ -1973,11 +1973,8 @@ router_dump_router_to_string(char *s, size_t maxlen, routerinfo_t *router,
   format_iso_time(published, router->cache_info.published_on);
 
   if (router->declared_family && smartlist_len(router->declared_family)) {
-    size_t n;
-    char *family = smartlist_join_strings(router->declared_family, " ", 0, &n);
-    n += strlen("family ") + 2; /* 1 for \n, 1 for \0. */
-    family_line = tor_malloc(n);
-    tor_snprintf(family_line, n, "family %s\n", family);
+    char *family = smartlist_join_strings(router->declared_family, " ", 0, NULL);
+    tor_asprintf(&family_line, "family %s\n", family);
     tor_free(family);
   } else {
     family_line = tor_strdup("");