diff --git a/apps/emqx/mix.exs b/apps/emqx/mix.exs
index 69065eca5..2100b4459 100644
--- a/apps/emqx/mix.exs
+++ b/apps/emqx/mix.exs
@@ -35,7 +35,7 @@ defmodule EMQX.MixProject do
       {:hocon, github: "emqx/hocon"},
       {:pbkdf2, github: "emqx/erlang-pbkdf2", tag: "2.0.4"},
       {:snabbkaffe, github: "kafka4beam/snabbkaffe", tag: "0.14.0"},
-			{:jiffy, github: "emqx/jiffy", tag: "1.0.5"}
+      {:jiffy, github: "emqx/jiffy", tag: "1.0.5"}
     ]
   end
 end
diff --git a/apps/emqx_release_helper/lib/emqx_release_helper/applications.ex b/apps/emqx_release_helper/lib/emqx_release_helper/applications.ex
index a2bc0c6fb..d80bcb043 100644
--- a/apps/emqx_release_helper/lib/emqx_release_helper/applications.ex
+++ b/apps/emqx_release_helper/lib/emqx_release_helper/applications.ex
@@ -15,9 +15,9 @@ defmodule EmqxReleaseHelper.Applications do
   application :emqx_machine do
     start_type :permanent
 
-		overlay do
-			template "etc/emqx.conf.all", "etc/emqx.conf"
-		end
+    overlay do
+      template "etc/emqx.conf.all", "etc/emqx.conf"
+    end
   end
 
   application :emqx_bridge do