diff --git a/apps/emqx_management/src/emqx_mgmt_api_subscriptions.erl b/apps/emqx_management/src/emqx_mgmt_api_subscriptions.erl
index 4f43d0588..e6e8bb475 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_subscriptions.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_subscriptions.erl
@@ -188,9 +188,9 @@ format(WhichNode, {{Topic, _Subscriber}, Options}) ->
     ).
 
 get_topic(Topic, #{share := <<"$queue">> = Group}) ->
-    filename:join([Group, Topic]);
+    emqx_topic:join([Group, Topic]);
 get_topic(Topic, #{share := Group}) ->
-    filename:join([<<"$share">>, Group, Topic]);
+    emqx_topic:join([<<"$share">>, Group, Topic]);
 get_topic(Topic, _) ->
     Topic.