diff --git a/lib/platform/bitbucket/index.ts b/lib/platform/bitbucket/index.ts
index 1b9803120d8c79b4a6c1e4da6e4c9dbc8b37861d..0d5ae4bf0390e2aed5e0e4f3826fba1d2c5acad6 100644
--- a/lib/platform/bitbucket/index.ts
+++ b/lib/platform/bitbucket/index.ts
@@ -818,6 +818,8 @@ export async function mergePr({
     );
     logger.debug('Automerging succeeded');
   } catch (err) /* istanbul ignore next */ {
+    logger.debug({ err }, `PR merge error`);
+    logger.info({ pr: prNo }, 'PR automerge failed');
     return false;
   }
   return true;