diff --git a/tests/legacy-cli/e2e/utils/project.ts b/tests/legacy-cli/e2e/utils/project.ts
index 550e560a45d4..7e7b1c9684a6 100644
--- a/tests/legacy-cli/e2e/utils/project.ts
+++ b/tests/legacy-cli/e2e/utils/project.ts
@@ -171,6 +171,11 @@ export function useCIDefaults(projectName = 'test-project') {
       // Use a random port in e2e.
       appTargets.e2e.options.port = 0;
     }
+
+    if (appTargets.serve) {
+      // Use a random port in serve.
+      appTargets.serve.options.port = 0;
+    }
   });
 }