diff --git a/build/source_list.bzl b/build/source_list.bzl
index 59d5cd7..2a2bb10 100644
--- a/build/source_list.bzl
+++ b/build/source_list.bzl
@@ -1400,6 +1400,7 @@
 ]
 default_platform_impl_test_support_hdrs = [
     "common/platform/default/quiche_platform_impl/quiche_test_loopback_impl.h",
+    "common/platform/default/quiche_platform_impl/quiche_thread_impl.h",
 ]
 default_platform_impl_test_support_srcs = [
     "common/platform/default/quiche_platform_impl/quiche_test_loopback_impl.cc",