diff --git a/lib/rack/attack.rb b/lib/rack/attack.rb
index 98eaa76..d402775 100644
--- a/lib/rack/attack.rb
+++ b/lib/rack/attack.rb
@@ -37,10 +37,10 @@ module Rack::Attack
 
       # Set defaults
       @notifier ||= ActiveSupport::Notifications if defined?(ActiveSupport::Notifications)
-      @blacklisted_response ||= lambda {|env| [503, {}, ['Blocked']] }
+      @blacklisted_response ||= lambda {|env| [503, {}, ["Blocked\n"]] }
       @throttled_response   ||= lambda {|env|
         retry_after = env['rack.attack.match_data'][:period] rescue nil
-        [503, {'Retry-After' => retry_after.to_s}, ['Retry later']]
+        [503, {'Retry-After' => retry_after.to_s}, ["Retry later\n"]]
       }
 
       self