diff --git a/plugins/libkolab/lib/kolab_storage_cache.php b/plugins/libkolab/lib/kolab_storage_cache.php
index 004776e0..31590abc 100644
--- a/plugins/libkolab/lib/kolab_storage_cache.php
+++ b/plugins/libkolab/lib/kolab_storage_cache.php
@@ -680,6 +680,8 @@ class kolab_storage_cache
             $this->resource_uri,
             'lock'
         );
+
+        $this->synclock = false;
     }
 
     /**