diff --git a/Makefile b/Makefile
index 4355cc413..3711319dd 100644
--- a/Makefile
+++ b/Makefile
@@ -25,8 +25,8 @@ EUNIT_OPTS = verbose
 # EUNIT_ERL_OPTS =
 
 CT_SUITES = emqttd emqttd_access emqttd_lib emqttd_inflight emqttd_mod \
-			emqttd_net emqttd_mqueue emqttd_protocol emqttd_topic \
-			emqttd_trie emqttd_vm
+            emqttd_net emqttd_mqueue emqttd_protocol emqttd_topic \
+            emqttd_trie emqttd_vm
 
 CT_OPTS = -cover test/ct.cover.spec -erl_args -name emqttd_ct@127.0.0.1