diff --git a/auto_submit/lib/requests/check_pull_request.dart b/auto_submit/lib/requests/check_pull_request.dart
index d168732b2..3b71355b2 100644
--- a/auto_submit/lib/requests/check_pull_request.dart
+++ b/auto_submit/lib/requests/check_pull_request.dart
@@ -53,7 +53,7 @@ class CheckPullRequest extends AuthenticatedRequestHandler {
       final String messageData = message.message!.data!;
       final rawBody = json.decode(String.fromCharCodes(base64.decode(messageData))) as Map<String, dynamic>;
       final PullRequest pullRequest = PullRequest.fromJson(rawBody);
-      log.info('Processing PR: $pullRequest');
+      log.info('Processing PR: $rawBody');
       if (processingLog.contains(pullRequest.number)) {
         // Ack duplicate.
         log.info('Ack the duplicated message : ${message.ackId!}.');
@@ -61,7 +61,7 @@ class CheckPullRequest extends AuthenticatedRequestHandler {
         continue;
       } else {
         await approver.approve(pullRequest);
-        log.info('Approved pull request: $pullRequest');
+        log.info('Approved pull request: $rawBody');
         processingLog.add(pullRequest.number!);
       }
       futures.add(validationService.processMessage(pullRequest, message.ackId!, pubsub));
diff --git a/auto_submit/lib/service/validation_service.dart b/auto_submit/lib/service/validation_service.dart
index fb4a69e89..9e19cc6eb 100644
--- a/auto_submit/lib/service/validation_service.dart
+++ b/auto_submit/lib/service/validation_service.dart
@@ -61,7 +61,7 @@ class ValidationService {
   /// Processes a pub/sub message associated with PullRequest event.
   Future<void> processMessage(github.PullRequest messagePullRequest, String ackId, PubSub pubsub) async {
     if (!await shouldProcess(messagePullRequest)) {
-      log.info('Shout not process $messagePullRequest, and ack the message.');
+      log.info('Shout not process ${messagePullRequest.toJson()}, and ack the message.');
       await pubsub.acknowledge('auto-submit-queue-sub', ackId);
       return;
     }