diff --git a/sdk/lib/_internal/dartdoc/lib/dartdoc.dart b/sdk/lib/_internal/dartdoc/lib/dartdoc.dart
index b20f3cb..845891c 100644
--- a/sdk/lib/_internal/dartdoc/lib/dartdoc.dart
+++ b/sdk/lib/_internal/dartdoc/lib/dartdoc.dart
@@ -143,7 +143,7 @@
     'libPath': libPath.toNativePath()
   }).then((result) {
     if (result.first == 'success') return;
-    throw new AsyncError(result[1], result[2]);
+    throw result[1];
   });
 }