diff --git a/zou/app/blueprints/crud/organisation.py b/zou/app/blueprints/crud/organisation.py
index 2aaa7a27d9..fc33a0a857 100644
--- a/zou/app/blueprints/crud/organisation.py
+++ b/zou/app/blueprints/crud/organisation.py
@@ -1,6 +1,8 @@
 from zou.app.models.organisation import Organisation
 from zou.app.blueprints.crud.base import BaseModelResource, BaseModelsResource
 
+from zou.app.services import persons_service
+
 
 class OrganisationsResource(BaseModelsResource):
     def __init__(self):
@@ -21,3 +23,7 @@ def pre_update(self, instance_dict, data):
         if "hours_by_day" in data:
             data["hours_by_day"] = float(data["hours_by_day"])
         return data
+
+    def post_update(self, instance_dict, data):
+        persons_service.clear_oranisation_cache()
+        return instance_dict