diff --git a/apps/emqttd/src/emqttd_acl.erl b/apps/emqttd/src/emqttd_acl.erl
index 02350e7d4..1184d87ce 100644
--- a/apps/emqttd/src/emqttd_acl.erl
+++ b/apps/emqttd/src/emqttd_acl.erl
@@ -141,7 +141,7 @@ stop() ->
 %%% gen_server callbacks.
 %%%=============================================================================
 init([AclMods]) ->
-    ets:new(?ACL_TABLE, [set, protected, named_table]),
+    ets:new(?ACL_TABLE, [set, protected, named_table, {read_concurrency, true}]),
     AclMods1 = lists:map(
             fun({M, Opts}) ->
                 AclMod = aclmod(M),
diff --git a/apps/emqttd/src/emqttd_acl_internal.erl b/apps/emqttd/src/emqttd_acl_internal.erl
index 593c8368d..106345bb1 100644
--- a/apps/emqttd/src/emqttd_acl_internal.erl
+++ b/apps/emqttd/src/emqttd_acl_internal.erl
@@ -60,7 +60,7 @@ all_rules() ->
 %% @doc init internal ACL.
 -spec init(AclOpts :: list()) -> {ok, State :: any()}.
 init(AclOpts) ->
-    ets:new(?ACL_RULE_TABLE, [set, public, named_table]),
+    ets:new(?ACL_RULE_TABLE, [set, public, named_table, {read_concurrency, true}]),
     AclFile = proplists:get_value(file, AclOpts),
     Default = proplists:get_value(nomatch, AclOpts, allow),
     State = #state{acl_file = AclFile, nomatch = Default},