diff --git a/src/config.coffee b/src/config.coffee
index 888193059..489e16016 100644
--- a/src/config.coffee
+++ b/src/config.coffee
@@ -699,7 +699,7 @@ class Config
         @endTransaction()
         fn(args...)
       result = callback()
-      new Promise (resolve, reject) =>
+      new Promise (resolve, reject) ->
         result.then(endTransaction(resolve)).catch(endTransaction(reject))
     catch error
       @endTransaction()