diff --git a/doc/source/awb_oldenburg_de.md b/doc/source/awb_oldenburg_de.md
index 127b877a..cd5f3bc9 100644
--- a/doc/source/awb_oldenburg_de.md
+++ b/doc/source/awb_oldenburg_de.md
@@ -29,5 +29,5 @@ waste_collection_schedule:
     - name: awb_oldenburg_de
       args:
         street: 'Friedhofsweg'
-        house_number: 30
+        house_number: '30'
 ```