diff --git a/runbot/models/repo.py b/runbot/models/repo.py
index 2d50eeaa..8ee64b69 100644
--- a/runbot/models/repo.py
+++ b/runbot/models/repo.py
@@ -577,12 +577,16 @@ class runbot_repo(models.Model):
         self.env['runbot.build']._local_cleanup()
 
         # 3. docker cleanup
-        containers = {int(dc.split('-', 1)[0]):dc for dc in docker_ps() if dest_reg.match(dc)}
+        docker_ps_result = docker_ps()
+        containers = {int(dc.split('-', 1)[0]):dc for dc in docker_ps_result if dest_reg.match(dc)}
         if containers:
             candidates = self.env['runbot.build'].search([('id', 'in', list(containers.keys())), ('local_state', '=', 'done')])
             for c in candidates:
                 _logger.info('container %s found running with build state done', containers[c.id])
                 docker_stop(containers[c.id])
+        ignored = {dc for dc in docker_ps_result if not dest_reg.match(dc)}
+        if ignored:
+            _logger.debug('docker (%s) not deleted because not dest format', " ".join(list(ignored)))
 
         timeout = self._get_cron_period()
         icp = self.env['ir.config_parameter']