diff --git a/spec/google/apis/errors_spec.rb b/spec/google/apis/errors_spec.rb
index 4585679e8..ad2a576e3 100644
--- a/spec/google/apis/errors_spec.rb
+++ b/spec/google/apis/errors_spec.rb
@@ -80,10 +80,8 @@ RSpec.describe Google::Apis::Error do
 
     context '@cause is falsy' do
       before do
-        subject.class.superclass.class_eval do
-          def backtrace
-            "super class's #backtrace called"
-          end
+        subject.class.superclass.any_instance.stub(:backtrace) do
+          "super class's #backtrace called"
         end
       end