diff --git a/update_engine.gyp b/update_engine.gyp
index c838117..b839413 100644
--- a/update_engine.gyp
+++ b/update_engine.gyp
@@ -538,6 +538,7 @@
             'payload_generator/topological_sort_unittest.cc',
             'payload_generator/zip_unittest.cc',
             'payload_state_unittest.cc',
+            'proxy_resolver_unittest.cc',
             'update_attempter_unittest.cc',
             'update_manager/boxed_value_unittest.cc',
             'update_manager/chromeos_policy_unittest.cc',