diff --git a/src/agenda_culturel/views.py b/src/agenda_culturel/views.py
index 3901f95..781a990 100644
--- a/src/agenda_culturel/views.py
+++ b/src/agenda_culturel/views.py
@@ -1097,7 +1097,7 @@ def export_ical(request, cat=None, tag=None, organisation_pk=None, place_pk=None
     if extra is None:
         extra = ""
     if category is not None:
-        extra += " " + category
+        extra += " " + str(category)
     if place_pk is not None:
         extra += (
             " @ " + Place.objects.filter(pk=place_pk).values("name").first()["name"]