diff --git a/payload_generator/delta_diff_utils.cc b/payload_generator/delta_diff_utils.cc
index 877e13f..bb98c62 100644
--- a/payload_generator/delta_diff_utils.cc
+++ b/payload_generator/delta_diff_utils.cc
@@ -214,8 +214,8 @@
   void MergeOperation(vector<AnnotatedOperation>* aops);
 
  private:
-  const string& old_part_;
-  const string& new_part_;
+  const string& old_part_;  // NOLINT(runtime/member_string_references)
+  const string& new_part_;  // NOLINT(runtime/member_string_references)
   const PayloadVersion& version_;
 
   // The block ranges of the old/new file within the src/tgt image
@@ -343,6 +343,36 @@
                                        hard_chunk_blocks,
                                        blob_file);
   }
+  // Process all the blocks not included in any file. We provided all the unused
+  // blocks in the old partition as available data.
+  vector<Extent> new_unvisited = {
+      ExtentForRange(0, new_part.size / kBlockSize)};
+  new_unvisited = FilterExtentRanges(new_unvisited, new_visited_blocks);
+  if (!new_unvisited.empty()) {
+    vector<Extent> old_unvisited;
+    if (old_part.fs_interface) {
+      old_unvisited.push_back(ExtentForRange(0, old_part.size / kBlockSize));
+      old_unvisited = FilterExtentRanges(old_unvisited, old_visited_blocks);
+    }
+
+    LOG(INFO) << "Scanning " << utils::BlocksInExtents(new_unvisited)
+              << " unwritten blocks using chunk size of " << soft_chunk_blocks
+              << " blocks.";
+    // We use the soft_chunk_blocks limit for the <non-file-data> as we don't
+    // really know the structure of this data and we should not expect it to
+    // have redundancy between partitions.
+    file_delta_processors.emplace_back(
+        old_part.path,
+        new_part.path,
+        version,
+        std::move(old_unvisited),
+        std::move(new_unvisited),
+        vector<puffin::BitExtent>{},  // old_deflates,
+        vector<puffin::BitExtent>{},  // new_deflates
+        "<non-file-data>",            // operation name
+        soft_chunk_blocks,
+        blob_file);
+  }
 
   size_t max_threads = GetMaxThreads();
   base::DelegateSimpleThreadPool thread_pool("incremental-update-generator",
@@ -357,38 +387,6 @@
     processor.MergeOperation(aops);
   }
 
-  // Process all the blocks not included in any file. We provided all the unused
-  // blocks in the old partition as available data.
-  vector<Extent> new_unvisited = {
-      ExtentForRange(0, new_part.size / kBlockSize)};
-  new_unvisited = FilterExtentRanges(new_unvisited, new_visited_blocks);
-  if (new_unvisited.empty())
-    return true;
-
-  vector<Extent> old_unvisited;
-  if (old_part.fs_interface) {
-    old_unvisited.push_back(ExtentForRange(0, old_part.size / kBlockSize));
-    old_unvisited = FilterExtentRanges(old_unvisited, old_visited_blocks);
-  }
-
-  LOG(INFO) << "Scanning " << utils::BlocksInExtents(new_unvisited)
-            << " unwritten blocks using chunk size of " << soft_chunk_blocks
-            << " blocks.";
-  // We use the soft_chunk_blocks limit for the <non-file-data> as we don't
-  // really know the structure of this data and we should not expect it to have
-  // redundancy between partitions.
-  TEST_AND_RETURN_FALSE(DeltaReadFile(aops,
-                                      old_part.path,
-                                      new_part.path,
-                                      old_unvisited,
-                                      new_unvisited,
-                                      {},                 // old_deflates,
-                                      {},                 // new_deflates
-                                      "<non-file-data>",  // operation name
-                                      soft_chunk_blocks,
-                                      version,
-                                      blob_file));
-
   return true;
 }