diff --git a/colloscope/views.py b/colloscope/views.py
index aae0147..da89fee 100644
--- a/colloscope/views.py
+++ b/colloscope/views.py
@@ -190,7 +190,7 @@ def icalendar(request):
         except LienCalendrier.DoesNotExist:
             return HttpResponse("Invalid key", status_code=404)
     else:
-        return icalendar_aux(request)
+        return HttpResponse("Unspecified key", status_code=404)
 
 def data_dump(request):
     template = loader.get_template("data_dump.html")