diff --git a/spec/integration_with_pact_broker_config_spec.rb b/spec/integration_with_pact_broker_config_spec.rb
index 6fe7f44..1f74522 100644
--- a/spec/integration_with_pact_broker_config_spec.rb
+++ b/spec/integration_with_pact_broker_config_spec.rb
@@ -1,6 +1,7 @@
 require 'pact/provider_verifier/cli/verify'
 require 'pact/pact_broker'
 require 'pact/cli/run_pact_verification'
+require 'ostruct'
 
 describe "pact-provider-verifier with pact broker config" do
   before do
diff --git a/spec/lib/pact/provider_verifier/aggregate_pact_configs_spec.rb b/spec/lib/pact/provider_verifier/aggregate_pact_configs_spec.rb
index 3c06c2e..d2354a2 100644
--- a/spec/lib/pact/provider_verifier/aggregate_pact_configs_spec.rb
+++ b/spec/lib/pact/provider_verifier/aggregate_pact_configs_spec.rb
@@ -1,4 +1,5 @@
 require 'pact/provider_verifier/aggregate_pact_configs'
+require 'ostruct'
 
 module Pact
   module ProviderVerifier
diff --git a/spec/support/message_producer_verifier.ru b/spec/support/message_producer_verifier.ru
index 63c16f7..255e287 100644
--- a/spec/support/message_producer_verifier.ru
+++ b/spec/support/message_producer_verifier.ru
@@ -1,6 +1,7 @@
 # TODO provider states
 
 require 'json'
+require 'ostruct'
 
 class Provider
   def a_test_message
@@ -31,7 +32,7 @@ class HttpRequestHandler
     request_body = JSON.parse(env['rack.input'].read)
     message_descriptor = OpenStruct.new(request_body)
     response_body = @message_creator.create(message_descriptor)
-    [200, {'Content-Type' => 'application/json'}, [response_body.to_json]]
+    [200, {'content-type' => 'application/json'}, [response_body.to_json]]
   end
 
 end