diff --git a/index_charging-stations.json b/index_charging-stations.json
index fd89943..31c43c3 100644
--- a/index_charging-stations.json
+++ b/index_charging-stations.json
@@ -7,13 +7,13 @@
     },
     "subCategories": [
         {
-            "id": "charging-cars"
+            "id": "charging_cars"
         },
         {
-            "id": "charging-bicycles"
+            "id": "charging_bicycles"
         },
               {
-            "id": "charging-other"
+            "id": "charging_other"
         }
     ]
 }