diff --git a/delta_performer.cc b/delta_performer.cc
index 0a33811..68161d2 100644
--- a/delta_performer.cc
+++ b/delta_performer.cc
@@ -488,6 +488,10 @@
   return true;
 }
 
+bool DeltaPerformer::IsManifestValid() {
+  return manifest_valid_;
+}
+
 bool DeltaPerformer::CanPerformInstallOperation(
     const chromeos_update_engine::DeltaArchiveManifest_InstallOperation&
     operation) {