diff --git a/lib/ci/failure_aggregator.js b/lib/ci/failure_aggregator.js
index 9f94b39e..4105eb1c 100644
--- a/lib/ci/failure_aggregator.js
+++ b/lib/ci/failure_aggregator.js
@@ -24,16 +24,18 @@ function formatSource(source) {
   return parsed ? `${parsed.owner}/${parsed.repo}#${parsed.prid}` : source;
 }
 
-function formatTargetBranches(pr, markdown = false) {
-  if (!parsePRFromURL(pr.source)) {
+function formatTargetBranches({ source, targetBranches }, markdown = false) {
+  if (!parsePRFromURL(source) || (targetBranches.length === 1 && targetBranches[0] === 'main')) {
     return '';
   }
-  const branches = pr.targetBranches
-    .filter(branch => branch !== 'main')
+  if (targetBranches.length === 0) {
+    return ' (target: none)';
+  }
+  const branches = targetBranches
     .map(branch => markdown
       ? branch.replace(/[&<>"'\\`*_[\]{}()!|~]/g, char => `&#${char.charCodeAt(0)};`)
       : branch);
-  return branches.length ? ` (target: ${branches.join(', ')})` : '';
+  return ` (target: ${branches.join(', ')})`;
 }
 
 export class FailureAggregator {