diff --git a/spec/couchrest/core/model_spec.rb b/spec/couchrest/core/model_spec.rb
index e9b7a1a..7564b81 100644
--- a/spec/couchrest/core/model_spec.rb
+++ b/spec/couchrest/core/model_spec.rb
@@ -234,7 +234,7 @@ describe CouchRest::Model do
     end
     
     it "should set the id" do
-      @obj.id.should be_an_instance_of String
+      @obj.id.should be_an_instance_of(String)
     end
     
     it "should set the type" do