diff --git a/roles/koschei/tasks/main.yml b/roles/koschei/tasks/main.yml
index b6535aaa42..e602d3a872 100644
--- a/roles/koschei/tasks/main.yml
+++ b/roles/koschei/tasks/main.yml
@@ -171,7 +171,7 @@
 
 - name: HOTFIX datetime error on unfinished tasks with finished parent
   lineinfile: dest="/usr/lib/python2.7/site-packages/koschei/backend.py"
-              regexp="finished=datetime.fromtimestamp(task['completion_ts']),"
+              regexp="finished=datetime\.fromtimestamp\(task\['completion_ts'\]\),"
               line="finished=datetime.fromtimestamp(task['completion_ts']) if task['completion_ts'] else None,"
   when: env == "production"
   tags: