diff --git a/assets/manifest.schema.json b/assets/manifest.schema.json
index e62ec58..b29934d 100644
--- a/assets/manifest.schema.json
+++ b/assets/manifest.schema.json
@@ -136,7 +136,7 @@
 						}
 					},
 					"required": ["type", "protocol"],
-					"additionalProperties": true
+					"additionalProperties": false
 				}
 			},
 			"additionalProperties": false