diff --git a/app/models/application_setting.rb b/app/models/application_setting.rb
index 3a2f69fde9753439dae5625dce54bd149fd15747..d64a847d48702efc04aca769c759fb73bc5f379e 100644
--- a/app/models/application_setting.rb
+++ b/app/models/application_setting.rb
@@ -311,7 +311,7 @@ class ApplicationSetting < ActiveRecord::Base
       errors.add(:default_artifacts_expiration,
         "can't be 0. Leave it blank for no expiration")
     end
-  rescue ChronicDuration::DurationParseError => e
+  rescue ChronicDuration::DurationParseError
     errors.add(:default_artifacts_expiration, "is invalid")
   end
 end