diff --git a/tools/gn/bootstrap/bootstrap.py b/tools/gn/bootstrap/bootstrap.py
index fa81d10..aab92c2 100755
--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -373,6 +373,7 @@
       'base/base_switches.cc',
       'base/callback_internal.cc',
       'base/command_line.cc',
+      'base/debug/activity_tracker.cc',
       'base/debug/alias.cc',
       'base/debug/stack_trace.cc',
       'base/debug/task_annotator.cc',