diff --git a/src/or/circuitbuild.c b/src/or/circuitbuild.c
index 17199053c9..72c839b238 100644
--- a/src/or/circuitbuild.c
+++ b/src/or/circuitbuild.c
@@ -2716,6 +2716,7 @@ routerinfo_get_configured_bridge(routerinfo_t *ri)
   return NULL;
 }
 
+/** Return 1 if <b>ri</b> is one of our known bridges, else 0. */
 int
 routerinfo_is_a_configured_bridge(routerinfo_t *ri)
 {
@@ -2809,7 +2810,7 @@ fetch_bridge_descriptors(time_t now)
                                      1, bridge->identity,
                                      DIR_PURPOSE_FETCH_SERVERDESC,
                                      ROUTER_PURPOSE_BRIDGE,
-                                     0, "authority", NULL, 0);
+                                     0, "authority.z", NULL, 0);
         }
       } else {
         /* we have a digest and we want to ask an authority. */
diff --git a/src/or/router.c b/src/or/router.c
index 7d3d621911..1137881e68 100644
--- a/src/or/router.c
+++ b/src/or/router.c
@@ -615,7 +615,7 @@ consider_testing_reachability(int test_or, int test_dir)
                                0, me->cache_info.identity_digest,
                                DIR_PURPOSE_FETCH_SERVERDESC,
                                ROUTER_PURPOSE_GENERAL,
-                               1, "authority", NULL, 0);
+                               1, "authority.z", NULL, 0);
 
     control_event_server_status(LOG_NOTICE,
                                 "CHECKING_REACHABILITY DIRADDRESS=%s:%d",