diff --git a/sdk/lib/vmservice/vmservice.dart b/sdk/lib/vmservice/vmservice.dart
index 10df9dee92e..8524da8f904 100644
--- a/sdk/lib/vmservice/vmservice.dart
+++ b/sdk/lib/vmservice/vmservice.dart
@@ -42,7 +42,7 @@ String _makeAuthToken() {
 final String serviceAuthToken = _makeAuthToken();
 
 // TODO(johnmccutchan): Enable the auth token and drop the origin check.
-final bool useAuthToken = const bool.fromEnvironment('DART_SERVICE_USE_AUTH');
+final bool useAuthToken = new bool.fromEnvironment('DART_SERVICE_USE_AUTH');
 
 // This is for use by the embedder. It is a map from the isolateId to
 // anything implementing IsolateEmbedderData. When an isolate goes away,