diff --git a/src/emqx_psk.erl b/src/emqx_psk.erl
index 3b2407b1c..ae2f8935b 100644
--- a/src/emqx_psk.erl
+++ b/src/emqx_psk.erl
@@ -19,8 +19,6 @@
 %% SSL PSK Callbacks
 -export([lookup/3]).
 
--define(TAB, ?MODULE).
-
 -type psk_identity() :: string().
 -type psk_user_state() :: term().