diff --git a/src/emqx_connection.erl b/src/emqx_connection.erl
index 2c2cc472d..bd9a9fbe4 100644
--- a/src/emqx_connection.erl
+++ b/src/emqx_connection.erl
@@ -123,7 +123,6 @@
                     , 'recv_msg.qos2'
                     , 'recv_msg.dropped'
                     , 'recv_msg.dropped.expired'
-
                     , send_pkt
                     , send_msg
                     , 'send_msg.qos0'
diff --git a/src/emqx_session.erl b/src/emqx_session.erl
index 9648083d9..3ba286f54 100644
--- a/src/emqx_session.erl
+++ b/src/emqx_session.erl
@@ -571,8 +571,9 @@ await(PacketId, Msg, Session = #session{inflight = Inflight}) ->
 %% Retry Delivery
 %%--------------------------------------------------------------------
 
--spec(retry(emqx_types:clientinfo(), session()) ->
-    {ok, session()} | {ok, replies(), timeout(), session()}).
+-spec(retry(emqx_types:clientinfo(), session())
+    -> {ok, session()}
+     | {ok, replies(), timeout(), session()}).
 retry(ClientInfo, Session = #session{inflight = Inflight, retry_interval = RetryInterval}) ->
     case emqx_inflight:is_empty(Inflight) of
         true  -> {ok, Session};