diff --git a/tools/gn/bootstrap/bootstrap.py b/tools/gn/bootstrap/bootstrap.py
index 0cee76e..b1924d5 100755
--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -210,6 +210,7 @@
       'base/sequence_checker_impl.cc',
       'base/sequenced_task_runner.cc',
       'base/sha1_portable.cc',
+      'base/strings/pattern.cc',
       'base/strings/string16.cc',
       'base/strings/string_number_conversions.cc',
       'base/strings/string_piece.cc',