diff --git a/app_dart/lib/src/service/luci_build_service.dart b/app_dart/lib/src/service/luci_build_service.dart
index 70d42d043..4bad36f10 100644
--- a/app_dart/lib/src/service/luci_build_service.dart
+++ b/app_dart/lib/src/service/luci_build_service.dart
@@ -464,7 +464,7 @@ class LuciBuildService {
             await _githubChecksUtil.createCheckRun(
               _config,
               slug,
-              checkRun.headSha ?? commitSha,
+              guard.commitSha,
               Config.kPresubmitCheckName,
               output: const CheckRunOutput(
                 title: Config.kPresubmitCheckName,