diff --git a/src/Yesod/Auth/OAuth2/Slack.hs b/src/Yesod/Auth/OAuth2/Slack.hs
index b909b5b..c844ad7 100644
--- a/src/Yesod/Auth/OAuth2/Slack.hs
+++ b/src/Yesod/Auth/OAuth2/Slack.hs
@@ -14,7 +14,7 @@ module Yesod.Auth.OAuth2.Slack
 import Yesod.Auth.OAuth2.Prelude
 
 import Network.HTTP.Client
-    (httpLbs, parseUrlThrow, responseBody, setQueryString)
+  (httpLbs, parseUrlThrow, responseBody, setQueryString)
 import Yesod.Auth.OAuth2.Exception as YesodOAuth2Exception
 
 data SlackScope