diff --git a/include/gTimer.hrl b/include/gTimer.hrl
index 8836c90..fbffc18 100644
--- a/include/gTimer.hrl
+++ b/include/gTimer.hrl
@@ -5,4 +5,4 @@
 -define(workCnt, workCnt).
 
 %% 三元表达式
--define(IIF(Cond, Ret1, Ret2), (case Cond of true -> Ret1; _ -> Ret2 end)).
\ No newline at end of file
+-define(CASE(Cond, Ret1, Ret2), (case Cond of true -> Ret1; _ -> Ret2 end)).
\ No newline at end of file
diff --git a/src/gTimer.erl b/src/gTimer.erl
index 4f60551..b4dc6ba 100644
--- a/src/gTimer.erl
+++ b/src/gTimer.erl
@@ -45,7 +45,7 @@ setTimer(Time, MFA) ->
 -spec setTimer(Time :: non_neg_integer(), MFA :: {module(), atom(), term()}, Strategy :: rand | bind) -> reference().
 setTimer(Time, MFA, Strategy) ->
    Cnt = ?gTimerCfg:getV(?workCnt),
-   Idx = ?IIF(Strategy == rand, rand:uniform(Cnt), erlang:phash2(self(), Cnt) + 1),
+   Idx = ?CASE(Strategy == rand, rand:uniform(Cnt), erlang:phash2(self(), Cnt) + 1),
    erlang:start_timer(Time, ?gTimerCfg:getV(Idx), MFA).
 
 -spec getTimer(TimerRef :: reference()) -> false |  non_neg_integer().