diff --git a/update_engine.gyp b/update_engine.gyp
index 6f0a140..9f68810 100644
--- a/update_engine.gyp
+++ b/update_engine.gyp
@@ -353,6 +353,7 @@
       'variables': {
         'exported_deps': [
           'ext2fs',
+          'libpuffdiff',
         ],
         'deps': ['<@(exported_deps)'],
       },