diff --git a/update_engine.gyp b/update_engine.gyp
index 0e0ba9f..e8e1fe9 100644
--- a/update_engine.gyp
+++ b/update_engine.gyp
@@ -412,6 +412,7 @@
         'payload_generator/payload_generation_config.cc',
         'payload_generator/payload_signer.cc',
         'payload_generator/raw_filesystem.cc',
+        'payload_generator/squashfs_filesystem.cc',
         'payload_generator/tarjan.cc',
         'payload_generator/topological_sort.cc',
         'payload_generator/xz_chromeos.cc',
@@ -559,6 +560,7 @@
             'payload_generator/payload_file_unittest.cc',
             'payload_generator/payload_generation_config_unittest.cc',
             'payload_generator/payload_signer_unittest.cc',
+            'payload_generator/squashfs_filesystem_unittest.cc',
             'payload_generator/tarjan_unittest.cc',
             'payload_generator/topological_sort_unittest.cc',
             'payload_generator/zip_unittest.cc',