diff --git a/aosp/dynamic_partition_control_android.cc b/aosp/dynamic_partition_control_android.cc
index ca12b3d..3ced3e0 100644
--- a/aosp/dynamic_partition_control_android.cc
+++ b/aosp/dynamic_partition_control_android.cc
@@ -1265,6 +1265,7 @@
   if (cow_writer == nullptr) {
     return nullptr;
   }
+  cow_writer->InitializeAppend(kEndOfInstallLabel);
   return cow_writer->OpenReader();
 }