diff --git a/lib/travis/api/app.rb b/lib/travis/api/app.rb
index 86301e08..0ad3a4c8 100644
--- a/lib/travis/api/app.rb
+++ b/lib/travis/api/app.rb
@@ -35,6 +35,8 @@ module Travis::Api
 
     Rack.autoload :SSL, 'rack/ssl'
 
+    ERROR_RESPONSE = JSON.generate(error: 'Travis encountered an error, sorry :(')
+
     # Used to track if setup already ran.
     def self.setup?
       @setup ||= false
@@ -117,7 +119,7 @@ module Travis::Api
       app.call(env)
     rescue
       if Endpoint.production?
-        [500, {'Content-Type' => 'application/json'}, ["{'error': 'Travis encountered an error, sorry :('}"]]
+        [500, {'Content-Type' => 'application/json'}, [ERROR_RESPONSE]]
       else
         raise
       end