diff --git a/apps/emqx_auth_http/src/emqx_acl_http.erl b/apps/emqx_auth_http/src/emqx_acl_http.erl
index d63c37d4c..4f9282a42 100644
--- a/apps/emqx_auth_http/src/emqx_acl_http.erl
+++ b/apps/emqx_auth_http/src/emqx_acl_http.erl
@@ -46,11 +46,11 @@ check_acl(ClientInfo, PubSub, Topic, _AclResult, #{acl := ACLParams = #{path :=
         {ok, 200, <<"ignore">>} -> ok;
         {ok, 200, _Body} -> {stop, allow};
         {ok, Code, _Body} ->
-            ?LOG(error, "Deny ~s to topic ~s, username: ~p, http response code: ~p",
+            ?LOG(error, "Deny ~s to topic ~ts, username: ~ts, http response code: ~p",
                  [PubSub, Topic, Username, Code]),
             {stop, deny};
         {error, Error} ->
-            ?LOG(error, "Deny ~s to topic ~s, username: ~p, due to request "
+            ?LOG(error, "Deny ~s to topic ~ts, username: ~ts, due to request "
                         "http server failure, path: ~p, error: ~0p",
                         [PubSub, Topic, Username, Path, Error]),
             ok
diff --git a/apps/emqx_auth_http/src/emqx_auth_http.erl b/apps/emqx_auth_http/src/emqx_auth_http.erl
index 1626bc745..3e63ea597 100644
--- a/apps/emqx_auth_http/src/emqx_auth_http.erl
+++ b/apps/emqx_auth_http/src/emqx_auth_http.erl
@@ -47,13 +47,13 @@ check(ClientInfo, AuthResult, #{auth  := AuthParms = #{path := Path},
                                 anonymous   => false,
                                 mountpoint  => mountpoint(Body, ClientInfo)}};
         {ok, Code, _Body} ->
-            ?LOG(error, "Deny connection from path: ~s, username: ~s, http "
+            ?LOG(error, "Deny connection from path: ~s, username: ~ts, http "
                         "response code: ~p",
                         [Path, Username, Code]),
             {stop, AuthResult#{auth_result => http_to_connack_error(Code),
                                anonymous   => false}};
         {error, Error} ->
-            ?LOG(error, "Deny connection from path: ~s, username: ~s, due to "
+            ?LOG(error, "Deny connection from path: ~s, username: ~ts, due to "
                         "request http-server failed: ~0p",
                  [Path, Username, Error]),
             %%FIXME later: server_unavailable is not right.