diff --git a/utils/schema-check/dn42-schema.py b/utils/schema-check/dn42-schema.py
index 85823f565..b816e9d69 100755
--- a/utils/schema-check/dn42-schema.py
+++ b/utils/schema-check/dn42-schema.py
@@ -377,6 +377,7 @@ def __index_files(path, use_file=None):
         "tinc-keyset/": SCHEMA_NAMESPACE + "tinc-keyset",
         "registry/": SCHEMA_NAMESPACE + "registry",
         "schema/": SCHEMA_NAMESPACE + "schema",
+        "key-cert/": SCHEMA_NAMESPACE + "key-cert",
     }
 
     for root, _, files in os.walk(path):