diff --git a/samples/client/petstore/ruby/spec/pet_spec.rb b/samples/client/petstore/ruby/spec/pet_spec.rb
index f66f33cf84c..68858c7b6cd 100644
--- a/samples/client/petstore/ruby/spec/pet_spec.rb
+++ b/samples/client/petstore/ruby/spec/pet_spec.rb
@@ -75,7 +75,9 @@ describe "Pet" do
 
     it "should create a pet" do
       pet = SwaggerClient::Pet.new('id' => 10002, 'name' => "RUBY UNIT TESTING")
-      SwaggerClient::PetApi.add_pet(:body => pet)
+      result = SwaggerClient::PetApi.add_pet(:body => pet)
+      # nothing is returned
+      result.should be_nil
 
       pet = SwaggerClient::PetApi.get_pet_by_id(10002)
       pet.id.should == 10002