diff --git a/screenless/bureau/ihr/ihrweb.py b/screenless/bureau/ihr/ihrweb.py
index d692c94..b45f7c2 100644
--- a/screenless/bureau/ihr/ihrweb.py
+++ b/screenless/bureau/ihr/ihrweb.py
@@ -87,7 +87,8 @@ class IhrApp(Bottle):
         return template.render_unicode(msg=msg, bureau=bureau, logdata=logdata)
 
     def register_bureau(self, bureau):
-        self.bureaus.append(bureau)
+        if not(bureau in self.bureaus):
+            self.bureaus.append(bureau)
 
     def register_crud(self, data):
         # adds callbacks for crud operations on a database