diff --git a/lib/platform/github/index.js b/lib/platform/github/index.js
index 91be8936dc704bfac4433ad69a1d68661a40ed4d..16da633074065ef209ed6f7419bb3e22d3e85ed8 100644
--- a/lib/platform/github/index.js
+++ b/lib/platform/github/index.js
@@ -461,9 +461,8 @@ async function addLabels(issueNo, labels) {
 async function getComments(issueNo) {
   // GET /repos/:owner/:repo/issues/:number/comments
   logger.debug(`Getting comments for #${issueNo}`);
-  const url = `repos/${
-    config.repoName
-  }/issues/${issueNo}/comments?per_page=100`;
+  const url = `repos/${config.parentRepo ||
+    config.repoName}/issues/${issueNo}/comments?per_page=100`;
   const comments = (await get(url, { paginate: true })).body;
   logger.debug(`Found ${comments.length} comments`);
   return comments;