diff --git a/src/agenda_culturel/celery.py b/src/agenda_culturel/celery.py
index 2ede094..dd1d927 100644
--- a/src/agenda_culturel/celery.py
+++ b/src/agenda_culturel/celery.py
@@ -58,6 +58,11 @@ def memcache_chromium_lock(oid):
             # also don't release the lock if we didn't acquire it
             cache.delete(lock_id)
 
+@contextmanager
+def free_memecache_chromium_lock():
+    lock_id = "chromium-lock"
+    cache.delete(lock_id)
+
 
 def close_import_task(taskid, success, error_message, importer):
     from agenda_culturel.models import BatchImportation