diff --git a/packages/@angular/cli/tasks/serve.ts b/packages/@angular/cli/tasks/serve.ts
index 40a597240bdc..746b4ff65103 100644
--- a/packages/@angular/cli/tasks/serve.ts
+++ b/packages/@angular/cli/tasks/serve.ts
@@ -281,7 +281,7 @@ export default Task.extend({
             return reject(err);
           }
           if (serveTaskOptions.open) {
-            opn(serverAddress);
+            opn(serverAddress + servePath);
           }
         });
       // Node 8 has a keepAliveTimeout bug which doesn't respect active connections.