diff --git a/spec/models/fluentd/agent_spec.rb b/spec/models/fluentd/agent_spec.rb
index a946ca7..0baef63 100644
--- a/spec/models/fluentd/agent_spec.rb
+++ b/spec/models/fluentd/agent_spec.rb
@@ -98,7 +98,7 @@ describe Fluentd::Agent do
     end
   end
 
-  describe "TdAgent" do
+  describe "TdAgent", td_agent_required: true do
     let(:described_class) { Fluentd::Agent::TdAgent } # override nested described_class behavior as https://github.com/rspec/rspec-core/issues/1114
 
     it_should_behave_like "Fluentd::Agent has common behavior"
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index d315e94..e4c349f 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -62,6 +62,12 @@ RSpec.configure do |config|
   # rspec 2.99
   config.infer_spec_type_from_file_location!
 
+  unless File.directory?("/opt/td-agent")
+    # including td-agent specific tests, so some tests will fail if the system has no td-agent
+    warn "\n\nSkipping td-agent specific tests (system has no td-agent)\n\n"
+    config.filter_run_excluding :td_agent_required => true
+  end
+
   config.after(:suite) do
     FileUtils.rm_rf FluentdUI.data_dir
   end