diff --git a/SConstruct b/SConstruct
index abf5253..09a6566 100644
--- a/SConstruct
+++ b/SConstruct
@@ -259,6 +259,7 @@
                             tarjan_unittest.cc
                             test_utils.cc
                             topological_sort_unittest.cc
+                            update_attempter_unittest.cc
                             update_check_scheduler_unittest.cc
                             utils_unittest.cc
                             zip_unittest.cc""")