diff --git a/apps/emqx_gateway/src/emqx_gateway_conf.erl b/apps/emqx_gateway/src/emqx_gateway_conf.erl
index 66323c53c..9e5893639 100644
--- a/apps/emqx_gateway/src/emqx_gateway_conf.erl
+++ b/apps/emqx_gateway/src/emqx_gateway_conf.erl
@@ -97,11 +97,11 @@ maps_key_take(Ks, M) ->
     maps_key_take(Ks, M, []).
 maps_key_take([], M, Acc) ->
     {lists:reverse(Acc), M};
-maps_key_take([K|Ks], M, Acc) ->
+maps_key_take([K | Ks], M, Acc) ->
     case maps:take(K, M) of
         error -> throw(bad_key);
         {V, M1} ->
-            maps_key_take(Ks, M1, [V|Acc])
+            maps_key_take(Ks, M1, [V | Acc])
     end.
 
 -spec update_gateway(atom_or_bin(), map()) -> ok_or_err().
@@ -384,7 +384,7 @@ pre_config_update(UnknownReq, _RawConf) ->
     -> ok | {ok, Result::any()} | {error, Reason::term()}.
 
 post_config_update(Req, NewConfig, OldConfig, _AppEnvs) when is_tuple(Req) ->
-    [_Tag, GwName0|_] = tuple_to_list(Req),
+    [_Tag, GwName0 | _] = tuple_to_list(Req),
     GwName = binary_to_existing_atom(GwName0),
 
     case {maps:get(GwName, NewConfig, undefined),
diff --git a/apps/emqx_machine/test/emqx_machine_SUITE.erl b/apps/emqx_machine/test/emqx_machine_SUITE.erl
index cce0778e2..03d9e6ba9 100644
--- a/apps/emqx_machine/test/emqx_machine_SUITE.erl
+++ b/apps/emqx_machine/test/emqx_machine_SUITE.erl
@@ -26,6 +26,23 @@
 all() -> emqx_common_test_helpers:all(?MODULE).
 
 init_per_suite(Config) ->
+    %% CASE-SIDE-EFFICT:
+    %%
+    %% Running-Seq:
+    %%   emqx_authz_api_mnesia_SUITE.erl
+    %%   emqx_gateway_api_SUITE.erl
+    %%   emqx_machine_SUITE.erl
+    %%
+    %% Reason:
+    %%   the `emqx_machine_boot:ensure_apps_started()` will crashed
+    %%   on starting `emqx_authz` with dirty confs, which caused the file
+    %%   `.._build/test/lib/emqx_conf/etc/acl.conf` could not be found
+    %%
+    %% Workaround:
+    %%   Unload emqx_authz to avoid reboot this application
+    %%
+    application:unload(emqx_authz),
+
     emqx_common_test_helpers:start_apps([]),
     Config.