diff --git a/kbcstorage/jobs.py b/kbcstorage/jobs.py
index 74fe796..71a6f2a 100644
--- a/kbcstorage/jobs.py
+++ b/kbcstorage/jobs.py
@@ -116,6 +116,7 @@ def block_until_completed(self, job_id):
             job = self.detail(job_id)
             if job['status'] in ('error', 'success'):
                 return job
+            retries += 1
             time.sleep(min(2 ** retries, 20))
 
     def block_for_success(self, job_id):