diff --git a/src/ecpool.appup.src b/src/ecpool.appup.src
index 3236224f..8cb933f9 100644
--- a/src/ecpool.appup.src
+++ b/src/ecpool.appup.src
@@ -1,8 +1,12 @@
 %% -*-: erlang -*-
-{"0.5.5",
+{"0.5.6",
   [
+    {"0.5.5", [
+      {load_module, ecpool, brutal_purge, soft_purge, []}
+    ]},
     {"0.5.4", [
-      {load_module, ecpool_worker, brutal_purge, soft_purge, []}
+      {load_module, ecpool_worker, brutal_purge, soft_purge, []},
+      {load_module, ecpool, brutal_purge, soft_purge, []}
     ]},
     {"0.5.3", [
       {load_module, ecpool_worker, brutal_purge, soft_purge, []},
@@ -23,8 +27,12 @@
     ]}
   ],
   [
+    {"0.5.5", [
+      {load_module, ecpool, brutal_purge, soft_purge, []}
+    ]},
     {"0.5.4", [
-      {load_module, ecpool_worker, brutal_purge, soft_purge, []}
+      {load_module, ecpool_worker, brutal_purge, soft_purge, []},
+      {load_module, ecpool, brutal_purge, soft_purge, []}
     ]},
     {"0.5.3", [
       {load_module, ecpool_worker, brutal_purge, soft_purge, []},
diff --git a/src/ecpool.erl b/src/ecpool.erl
index cb5349ec..0eeaa1f8 100644
--- a/src/ecpool.erl
+++ b/src/ecpool.erl
@@ -65,6 +65,8 @@
     | {on_disconnect, conn_callback()}
     | tuple().
 
+-define(IS_ACTION(ACTION), ((is_tuple(ACTION) andalso tuple_size(ACTION) == 3) orelse is_function(ACTION, 1))).
+
 pool_spec(ChildId, Pool, Mod, Opts) ->
     #{id => ChildId,
       start => {?MODULE, start_pool, [Pool, Mod, Opts]},
@@ -114,38 +116,38 @@ add_reconnect_callback(Pool, Callback) ->
 %% @doc Call the fun with client/connection
 -spec with_client(pool_name(), action(Result)) ->
     Result | {error, disconnected | ecpool_empty}.
-with_client(Pool, Fun) ->
+with_client(Pool, Fun) when ?IS_ACTION(Fun) ->
     with_worker(get_client(Pool), Fun, no_handover).
 
 %% @doc Call the fun with client/connection
 -spec with_client(pool_name(), any(), action(Result)) ->
     Result | {error, disconnected | ecpool_empty}.
-with_client(Pool, Key, Fun) ->
+with_client(Pool, Key, Fun) when ?IS_ACTION(Fun) ->
     with_worker(get_client(Pool, Key), Fun, no_handover).
 
 -spec pick_and_do({pool_name(), term()} | pool_name(), action(Result), apply_mode()) ->
     Result | {error, disconnected | ecpool_empty}.
-pick_and_do({Pool, KeyOrNum}, Action = {_,_,_}, ApplyMode) ->
+pick_and_do({Pool, KeyOrNum}, Action, ApplyMode) when ?IS_ACTION(Action) ->
     with_worker(get_client(Pool, KeyOrNum), Action, ApplyMode);
-pick_and_do(Pool, Action = {_,_,_}, ApplyMode) ->
+pick_and_do(Pool, Action, ApplyMode) when ?IS_ACTION(Action) ->
     with_worker(get_client(Pool), Action, ApplyMode).
 
 -spec with_worker(pid() | false, action(Result), apply_mode()) ->
     Result | {error, disconnected | ecpool_empty}.
-with_worker(false, _Action, _Mode) ->
+with_worker(false, Action, _Mode) when ?IS_ACTION(Action) ->
     {error, ecpool_empty};
-with_worker(Worker, Action, no_handover) ->
+with_worker(Worker, Action, no_handover) when ?IS_ACTION(Action) ->
     case ecpool_worker:client(Worker) of
         {ok, Client} -> exec(Action, Client);
         {error, Reason} -> {error, Reason}
     end;
-with_worker(Worker, Action, handover) ->
+with_worker(Worker, Action, handover) when ?IS_ACTION(Action) ->
     ecpool_worker:exec(Worker, Action, infinity);
-with_worker(Worker, Action, {handover, Timeout}) when is_integer(Timeout) ->
+with_worker(Worker, Action, {handover, Timeout}) when is_integer(Timeout) andalso ?IS_ACTION(Action) ->
     ecpool_worker:exec(Worker, Action, Timeout);
-with_worker(Worker, Action, handover_async) ->
+with_worker(Worker, Action, handover_async) when ?IS_ACTION(Action) ->
     ecpool_worker:exec_async(Worker, Action);
-with_worker(Worker, Action, {handover_async, CallbackFun = {_,_,_}}) ->
+with_worker(Worker, Action, {handover_async, CallbackFun = {_,_,_}}) when ?IS_ACTION(Action) ->
     ecpool_worker:exec_async(Worker, Action, CallbackFun).
 
 %% @doc Pool workers
diff --git a/test/ecpool_SUITE.erl b/test/ecpool_SUITE.erl
index c5e1662f..3515bd76 100644
--- a/test/ecpool_SUITE.erl
+++ b/test/ecpool_SUITE.erl
@@ -56,7 +56,8 @@ groups() ->
        t_client_exec_random,
        t_client_exec2_random,
        t_multiprocess_client,
-       t_multiprocess_client_not_restart
+       t_multiprocess_client_not_restart,
+       t_pick_and_do_fun
       ]}].
 
 init_per_suite(Config) ->
@@ -235,3 +236,11 @@ t_client_exec2_random(_Config) ->
         {result, 4} -> ok;
         R1 -> ct:fail({unexpected_result, R1})
     end.
+
+t_pick_and_do_fun(_Config) ->
+    Pool = ?FUNCTION_NAME,
+    Action = fun(Client) -> test_client:plus(Client, 1, 3) end,
+    Opts = [{pool_size, 5}, {pool_type, hash}, {auto_reconnect, false}],
+    {ok, _} = ecpool:start_pool(Pool, test_client, Opts),
+    ?assertEqual(4, ecpool:pick_and_do({Pool, <<"abc">>}, Action, no_handover)),
+    ecpool:stop_sup_pool(Pool).