diff --git a/spec/unit/lib/temporal/grpc_client_spec.rb b/spec/unit/lib/temporal/grpc_client_spec.rb
index d79420ef..566f1a33 100644
--- a/spec/unit/lib/temporal/grpc_client_spec.rb
+++ b/spec/unit/lib/temporal/grpc_client_spec.rb
@@ -1,5 +1,5 @@
 describe Temporal::Client::GRPCClient do
-  subject { Temporal::Client::GRPCClient.new(nil, nil, nil) }
+  subject { Temporal::Client::GRPCClient.new(nil, nil, nil, :this_channel_is_insecure) }
   let(:grpc_stub) { double('grpc stub') }
   let(:namespace) { 'test-namespace' }
   let(:workflow_id) { SecureRandom.uuid }
@@ -11,8 +11,6 @@
 
   describe '#start_workflow_execution' do
     it 'provides the existing run_id when the workflow is already started' do
-      client = Temporal::Client::GRPCClient.new(nil, nil, nil, :this_channel_is_insecure)
-      allow(client).to receive(:client).and_return(grpc_stub)
       allow(grpc_stub).to receive(:start_workflow_execution).and_raise(
         GRPC::AlreadyExists,
         'Workflow execution already finished successfully. WorkflowId: TestWorkflow-1, RunId: baaf1d86-4459-4ecd-a288-47aeae55245d. Workflow Id reuse policy: allow duplicate workflow Id if last run failed.'