diff --git a/payload_consumer/delta_performer.cc b/payload_consumer/delta_performer.cc
index cc36a4e..2ac783a 100644
--- a/payload_consumer/delta_performer.cc
+++ b/payload_consumer/delta_performer.cc
@@ -498,7 +498,10 @@
     // |num_total_operations_| limit yet.
     if (next_operation_num_ >= acc_num_operations_[current_partition_]) {
       if (partition_writer_) {
-        TEST_AND_RETURN_FALSE(partition_writer_->FinishedInstallOps());
+        if (!partition_writer_->FinishedInstallOps()) {
+          *error = ErrorCode::kDownloadWriteError;
+          return false;
+        }
       }
       CloseCurrentPartition();
       // Skip until there are operations for current_partition_.
diff --git a/payload_consumer/vabc_partition_writer.cc b/payload_consumer/vabc_partition_writer.cc
index a11bdf4..9db88a9 100644
--- a/payload_consumer/vabc_partition_writer.cc
+++ b/payload_consumer/vabc_partition_writer.cc
@@ -314,7 +314,8 @@
   TEST_AND_RETURN_FALSE(cow_writer_ != nullptr);
   TEST_AND_RETURN_FALSE(cow_writer_->AddLabel(kEndOfInstallLabel));
   TEST_AND_RETURN_FALSE(cow_writer_->Finalize());
-  return cow_writer_->VerifyMergeOps();
+  TEST_AND_RETURN_FALSE(cow_writer_->VerifyMergeOps());
+  return true;
 }
 
 VABCPartitionWriter::~VABCPartitionWriter() {