diff --git a/include/emqttd_internal.hrl b/include/emqttd_internal.hrl
index 548009279..6ed9d83d8 100644
--- a/include/emqttd_internal.hrl
+++ b/include/emqttd_internal.hrl
@@ -50,3 +50,9 @@
             {noreply, State}
         end)).
 
+-define(IF(Cond, TrueFun,FalseFun),
+        (case (Cond) of
+            true ->(TrueCase);
+            false->(FalseCase)
+        end)).
+