diff --git a/aosp/cow_converter.cc b/aosp/cow_converter.cc
index 3e8e5fd..32aa12f 100644
--- a/aosp/cow_converter.cc
+++ b/aosp/cow_converter.cc
@@ -95,6 +95,7 @@
                                   manifest.block_size(),
                                   cow_writer.get(),
                                   partition.new_partition_info().size(),
+                                  partition.old_partition_info().size(),
                                   false));
   TEST_AND_RETURN_FALSE(cow_writer->Finalize());
   return true;