diff --git a/custom/custom/views/swisscom_heatmap/entry.py b/custom/custom/views/swisscom_heatmap/entry.py
index 8cd1ce2fd..14f43bd29 100644
--- a/custom/custom/views/swisscom_heatmap/entry.py
+++ b/custom/custom/views/swisscom_heatmap/entry.py
@@ -45,6 +45,7 @@
 )  # type: ignore[import-untyped]
 
 
+@swisscom_heatmap_get_config.get(renderer="json")
 def entry_get_config(_request: pyramid.request.Request) -> pyramid.response.Response:
     return api.get_config()