diff --git a/update_engine.gyp b/update_engine.gyp
index f312a1d..f72ca14 100644
--- a/update_engine.gyp
+++ b/update_engine.gyp
@@ -181,6 +181,7 @@
         'payload_consumer/file_writer.cc',
         'payload_consumer/filesystem_verifier_action.cc',
         'payload_consumer/install_plan.cc',
+        'payload_consumer/mount_history.cc',
         'payload_consumer/payload_constants.cc',
         'payload_consumer/payload_verifier.cc',
         'payload_consumer/postinstall_runner_action.cc',