diff --git a/spec/request/internal/metrics_spec.rb b/spec/request/internal/metrics_spec.rb
index 62284d6b43d..221354c3c29 100644
--- a/spec/request/internal/metrics_spec.rb
+++ b/spec/request/internal/metrics_spec.rb
@@ -8,6 +8,10 @@
   delegate :app, to: :metrics_webserver
 
   before do
+    # Force Puma to bind to an ephemeral port (0) to avoid EADDRINUSE
+    allow_any_instance_of(Puma::Server).to receive(:add_tcp_listener).and_wrap_original do |m, host, _|
+      m.call(host, 0)
+    end
     allow_any_instance_of(VCAP::CloudController::Metrics::PeriodicUpdater).to receive(:update_webserver_stats)
     metrics_webserver.start(TestConfig.config_instance)
   end