diff --git a/packages/atclient/src/atdirectory.c b/packages/atclient/src/atdirectory.c
index 6bc50c02..664790ff 100644
--- a/packages/atclient/src/atdirectory.c
+++ b/packages/atclient/src/atdirectory.c
@@ -79,7 +79,7 @@ int atdirectory_lookup(struct atdirectory_connection *conn, const char *atsign,
     len--;
   }
 
-  if (len == 5 && strncmp((char *)buf, "null", 4) == 0) {
+  if (len == 4 && strncmp((char *)buf, "null", 4) == 0) {
     *atserver_host = NULL;
     *atserver_port = 0;
     free(read_buf);