diff --git a/CHANGELOG.md b/CHANGELOG.md
index e44a446..198b221 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # Changlog
 
 ## master (unreleased)
+ - Default throttled/blacklist responses have Content-Type: text/plain
  - Rack::Attack.clear! resets tracks
 
 ## v4.0.1 - 14 May 2014
diff --git a/lib/rack/attack.rb b/lib/rack/attack.rb
index 0ec982c..78fb386 100644
--- a/lib/rack/attack.rb
+++ b/lib/rack/attack.rb
@@ -80,10 +80,10 @@ class Rack::Attack
 
   # Set defaults
   @notifier             = ActiveSupport::Notifications if defined?(ActiveSupport::Notifications)
-  @blacklisted_response = lambda {|env| [403, {}, ["Forbidden\n"]] }
+  @blacklisted_response = lambda {|env| [403, {'Content-Type' => 'text/plain'}, ["Forbidden\n"]] }
   @throttled_response   = lambda {|env|
     retry_after = env['rack.attack.match_data'][:period] rescue nil
-    [429, {'Retry-After' => retry_after.to_s}, ["Retry later\n"]]
+    [429, {'Content-Type' => 'text/plain', 'Retry-After' => retry_after.to_s}, ["Retry later\n"]]
   }
 
   def initialize(app)