diff --git a/src/lib/net/address.c b/src/lib/net/address.c
index 0571f48a30..b09c9115c4 100644
--- a/src/lib/net/address.c
+++ b/src/lib/net/address.c
@@ -1693,16 +1693,12 @@ get_interface_address6,(int severity, sa_family_t family, tor_addr_t *addr))
   /* Find the first non-internal address, or the last internal address
    * Ideally, we want the default route, see #12377 for details */
   SMARTLIST_FOREACH_BEGIN(addrs, tor_addr_t *, a) {
-    char *addr_str;
-    int is_internal;
     tor_addr_copy(addr, a);
-    is_internal = tor_addr_is_internal(a, 0);
+    const bool is_internal = tor_addr_is_internal(a, 0);
     rv = 0;
 
-    addr_str = tor_addr_to_str_dup(addr);
     log_debug(LD_NET, "Found %s interface address '%s'",
-              (is_internal ? "internal" : "external"), addr_str);
-    tor_free(addr_str);
+              (is_internal ? "internal" : "external"), fmt_addr(addr));
 
     /* If we found a non-internal address, declare success.  Otherwise,
      * keep looking. */