diff --git a/update_engine.gyp b/update_engine.gyp
index 7cb2a7d..85632a2 100644
--- a/update_engine.gyp
+++ b/update_engine.gyp
@@ -391,6 +391,7 @@
         'payload_generator/annotated_operation.cc',
         'payload_generator/blob_file_writer.cc',
         'payload_generator/block_mapping.cc',
+        'payload_generator/boot_img_filesystem.cc',
         'payload_generator/bzip.cc',
         'payload_generator/cycle_breaker.cc',
         'payload_generator/deflate_utils.cc',
@@ -544,6 +545,7 @@
             'payload_generator/ab_generator_unittest.cc',
             'payload_generator/blob_file_writer_unittest.cc',
             'payload_generator/block_mapping_unittest.cc',
+            'payload_generator/boot_img_filesystem_unittest.cc',
             'payload_generator/cycle_breaker_unittest.cc',
             'payload_generator/deflate_utils_unittest.cc',
             'payload_generator/delta_diff_utils_unittest.cc',