diff --git a/inventory_provider/config.py b/inventory_provider/config.py
index 992052cafbc6437d56d36e362ed573885e94e1a0..23384f920165dacf2b7d83fd705b03fd2c69ba1b 100644
--- a/inventory_provider/config.py
+++ b/inventory_provider/config.py
@@ -187,7 +187,8 @@ CONFIG_SCHEMA = {
             'type': 'object',
             'patternProperties': {
                 r'^\d+$': {'type': 'string'}
-            }
+            },
+            'additionalProperties': False
         }
     },