diff --git a/plugins/calendar/drivers/kolab/kolab_calendar.php b/plugins/calendar/drivers/kolab/kolab_calendar.php
index 79df28a2..401b2954 100644
--- a/plugins/calendar/drivers/kolab/kolab_calendar.php
+++ b/plugins/calendar/drivers/kolab/kolab_calendar.php
@@ -303,7 +303,7 @@ class kolab_calendar extends kolab_storage_folder_api
     }
 
     // avoid session race conditions that will loose temporary subscriptions
-    $this->cal->rc->session->nowrite();
+    $this->cal->rc->session->nowrite = true;
 
     return $events;
   }
diff --git a/plugins/calendar/drivers/kolab/kolab_user_calendar.php b/plugins/calendar/drivers/kolab/kolab_user_calendar.php
index dc9bcf76..c52bfd72 100644
--- a/plugins/calendar/drivers/kolab/kolab_user_calendar.php
+++ b/plugins/calendar/drivers/kolab/kolab_user_calendar.php
@@ -223,7 +223,7 @@ class kolab_user_calendar extends kolab_calendar
     }
 
     // avoid session race conditions that will loose temporary subscriptions
-    $this->cal->rc->session->nowrite();
+    $this->cal->rc->session->nowrite = true;
 
     return $events;
   }
diff --git a/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php b/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php
index c362880c..715fc740 100644
--- a/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php
+++ b/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php
@@ -482,7 +482,7 @@ class tasklist_kolab_driver extends tasklist_driver
         }
 
         // avoid session race conditions that will loose temporary subscriptions
-        $this->plugin->rc->session->nowrite();
+        $this->plugin->rc->session->nowrite = true;
 
         return $counts;
     }
@@ -541,7 +541,7 @@ class tasklist_kolab_driver extends tasklist_driver
         }
 
         // avoid session race conditions that will loose temporary subscriptions
-        $this->plugin->rc->session->nowrite();
+        $this->plugin->rc->session->nowrite = true;
 
         return $results;
     }