diff --git a/spec/simple_oauth/header_spec.rb b/spec/simple_oauth/header_spec.rb
index 1413fee..5be9cb9 100644
--- a/spec/simple_oauth/header_spec.rb
+++ b/spec/simple_oauth/header_spec.rb
@@ -138,7 +138,7 @@ describe SimpleOAuth::Header do
         secrets = {:consumer_secret => rsa_private_key}
         header = SimpleOAuth::Header.new(:get, 'https://api.twitter.com/1/statuses/friends.json', {}, secrets.merge(:signature_method => 'RSA-SHA1'))
         parsed_header = SimpleOAuth::Header.new(:get, 'https://api.twitter.com/1/statuses/friends.json', {}, header)
-        expect { parsed_header.valid? }.to raise_error(TypeError)
+        expect { parsed_header.valid? }.to raise_error
         expect(parsed_header).to be_valid(secrets)
       end
     end