diff --git a/src/ruby/spec/call_spec.rb b/src/ruby/spec/call_spec.rb
index 4e767fc9f6e..88016751539 100644
--- a/src/ruby/spec/call_spec.rb
+++ b/src/ruby/spec/call_spec.rb
@@ -181,7 +181,7 @@ describe GRPC::Core::Call do
     end
   end
 
-  def make_test_call(&blk)
+  def make_test_call
     call = @ch.create_call(nil, nil, 'phony_method', nil, deadline)
     yield call
     call.close