diff --git a/shell/testing/observatory/launcher.dart b/shell/testing/observatory/launcher.dart
index 8e53db207e06062c52adfb4dda3e943ed19e98ab..b2df0664b382602fe2be5e30346ef62354181c0d 100644
--- a/shell/testing/observatory/launcher.dart
+++ b/shell/testing/observatory/launcher.dart
@@ -41,6 +41,7 @@ class ShellProcess {
 class ShellLauncher {
   final List<String> args = [
     '--observatory-port=0',
+    '--non-interactive',
   ];
   final String shellExecutablePath;
   final String mainDartPath;