diff --git a/mojo/mojo.gyp b/mojo/mojo.gyp
index 0351783..637b9ef 100644
--- a/mojo/mojo.gyp
+++ b/mojo/mojo.gyp
@@ -250,6 +250,8 @@
         'common/message_pump_mojo.cc',
         'common/message_pump_mojo.h',
         'common/message_pump_mojo_handler.h',
+        'common/time_helper.cc',
+        'common/time_helper.h',
       ],
     },
     {