diff --git a/apps/emqx_conf/test/emqx_conf_logger_SUITE.erl b/apps/emqx_conf/test/emqx_conf_logger_SUITE.erl
index accd3c95e..5ce6535b5 100644
--- a/apps/emqx_conf/test/emqx_conf_logger_SUITE.erl
+++ b/apps/emqx_conf/test/emqx_conf_logger_SUITE.erl
@@ -77,7 +77,8 @@ t_log_conf(_Conf) ->
         <<"rotation_count">> => 10,
         <<"rotation_size">> => <<"50MB">>,
         <<"time_offset">> => <<"system">>,
-        <<"path">> => <<"log/emqx.log">>
+        <<"path">> => <<"log/emqx.log">>,
+        <<"timestamp_format">> => <<"auto">>
     },
     ExpectLog1 = #{
         <<"console">> =>
@@ -85,7 +86,8 @@ t_log_conf(_Conf) ->
                 <<"enable">> => true,
                 <<"formatter">> => <<"text">>,
                 <<"level">> => <<"debug">>,
-                <<"time_offset">> => <<"system">>
+                <<"time_offset">> => <<"system">>,
+                <<"timestamp_format">> => <<"auto">>
             },
         <<"file">> =>
             #{<<"default">> => FileExpect},
diff --git a/apps/emqx_conf/test/emqx_conf_schema_tests.erl b/apps/emqx_conf/test/emqx_conf_schema_tests.erl
index 9d8827fad..4b4dff4cf 100644
--- a/apps/emqx_conf/test/emqx_conf_schema_tests.erl
+++ b/apps/emqx_conf/test/emqx_conf_schema_tests.erl
@@ -131,8 +131,9 @@ log.file_handlers {
         chars_limit => unlimited,
         depth => 100,
         single_line => true,
-        template => [time, " [", level, "] ", msg, "\n"],
-        time_offset => TimeOffset
+        template => ["[", level, "] ", msg, "\n"],
+        time_offset => TimeOffset,
+        timestamp_format => auto
     }}
 ).