diff --git a/apps/emqx_slow_subs/src/emqx_slow_subs.erl b/apps/emqx_slow_subs/src/emqx_slow_subs.erl
index bd61ff5a6..acb8c2b9c 100644
--- a/apps/emqx_slow_subs/src/emqx_slow_subs.erl
+++ b/apps/emqx_slow_subs/src/emqx_slow_subs.erl
@@ -299,13 +299,16 @@ do_clear_history() ->
     ets:delete_all_objects(?TOPK_TAB).
 
 check_enable(Enable, #{enable := IsEnable} = State) ->
-    case Enable of
-        IsEnable ->
-            State;
-        true ->
+    case {IsEnable, Enable} of
+        {false, true} ->
             load(State);
+        {true, false} ->
+            unload(State);
+        {true, true} ->
+            S1 = unload(State),
+            load(S1);
         _ ->
-            unload(State)
+            State
     end.
 
 start_timer(Name, Fun, State) ->
diff --git a/apps/emqx_slow_subs/test/emqx_slow_subs_SUITE.erl b/apps/emqx_slow_subs/test/emqx_slow_subs_SUITE.erl
index 10d858d44..1ddf59058 100644
--- a/apps/emqx_slow_subs/test/emqx_slow_subs_SUITE.erl
+++ b/apps/emqx_slow_subs/test/emqx_slow_subs_SUITE.erl
@@ -25,6 +25,7 @@
 -include_lib("emqx_slow_subs/include/emqx_slow_subs.hrl").
 
 -define(NOW, erlang:system_time(millisecond)).
+-define(CLUSTER_RPC_SHARD, emqx_cluster_rpc_shard).
 
 -define(BASE_CONF, <<"""
 slow_subs {
@@ -38,14 +39,28 @@ all() ->
     emqx_common_test_helpers:all(?MODULE).
 
 init_per_suite(Config) ->
+    application:load(emqx_conf),
+    ok = ekka:start(),
+    ok = mria_rlog:wait_for_shards([?CLUSTER_RPC_SHARD], infinity),
+    meck:new(emqx_alarm, [non_strict, passthrough, no_link]),
+    meck:expect(emqx_alarm, activate, 3, ok),
+    meck:expect(emqx_alarm, deactivate, 3, ok),
+
+
     ok = emqx_common_test_helpers:load_config(emqx_slow_subs_schema, ?BASE_CONF),
     emqx_common_test_helpers:start_apps([emqx_slow_subs]),
     Config.
 
 end_per_suite(_Config) ->
+    ekka:stop(),
+    mria:stop(),
+    mria_mnesia:delete_schema(),
+    meck:unload(emqx_alarm),
+
     emqx_common_test_helpers:stop_apps([emqx_slow_subs]).
 
 init_per_testcase(t_expire, Config) ->
+    {ok, _} = emqx_cluster_rpc:start_link(),
     Cfg = emqx_config:get([slow_subs]),
     emqx_slow_subs:update_settings(Cfg#{expire_interval := 1500}),
     Config;
@@ -54,6 +69,12 @@ init_per_testcase(_, Config) ->
     Config.
 
 end_per_testcase(_, _) ->
+    case erlang:whereis(node()) of
+        undefined -> ok;
+        P ->
+            erlang:unlink(P),
+            erlang:exit(P, kill)
+    end,
     ok.
 
 %%--------------------------------------------------------------------
@@ -93,7 +114,7 @@ t_expire(_) ->
     Each = fun(I) ->
                    ClientId = erlang:list_to_binary(io_lib:format("test_~p", [I])),
                    ets:insert(?TOPK_TAB, #top_k{index = ?TOPK_INDEX(1, ?ID(ClientId, <<"topic">>)),
-                                                last_update_time = Now})
+                                                last_update_time = Now - timer:minutes(5)})
            end,
 
     lists:foreach(Each, lists:seq(1, 5)),