diff --git a/participation/views.py b/participation/views.py
index f623662..41a70e0 100644
--- a/participation/views.py
+++ b/participation/views.py
@@ -1886,7 +1886,7 @@ class GSheetNotificationsView(View):
             return HttpResponse(status=404)
 
         tournament = await Tournament.objects.prefetch_related('participations', 'pools').aget(pk=kwargs['pk'])
-        expected_channel_id = sha1(f"{tournament.name}{timezone.now().date()}{request.site.domain}".encode()) \
+        expected_channel_id = sha1(f"{tournament.name}-{timezone.now().date()}-{request.site.domain}".encode()) \
             .hexdigest()
 
         if request.headers['X-Goog-Channel-ID'] != expected_channel_id: