diff --git a/include/ucore/fd_utils.h b/include/ucore/fd_utils.h
index b696e3a..bdb31f4 100644
--- a/include/ucore/fd_utils.h
+++ b/include/ucore/fd_utils.h
@@ -35,14 +35,14 @@ int uc_set_tcp_keepalive(int sockfd);
 
 
 struct UCKeepConfig {
-    /** The maximum number of keepalive probes TCP should 
-     * send before dropping the connection. (TCP_KEEPCNT socket option)
-     */
-    int keepcnt;
     /** The time (in seconds) the connection needs to remain 
      * idle before TCP starts sending keepalive probes (TCP_KEEPIDLE socket option)
      */
     int keepidle;
+    /** The maximum number of keepalive probes TCP should 
+     * send before dropping the connection. (TCP_KEEPCNT socket option)
+     */
+    int keepcnt;
     /** The time (in seconds) between individual keepalive probes.
      *  (TCP_KEEPINTVL socket option)
      */