diff --git a/etc/default_data.schema.json b/etc/default_data.schema.json
index 6807970ec..abbb096fb 100644
--- a/etc/default_data.schema.json
+++ b/etc/default_data.schema.json
@@ -28,7 +28,7 @@
                         "type": "array",
                         "items": {
                             "type": "string",
-                            "pattern": "^[a-z\\d_\\.\\+-]+@([a-z\\d\\.-]+\\.)+(([a-z]+)|\\(none\\))$"
+                            "pattern": "^[a-z\\d_\\.\\+-]+@([a-z\\d\\.-]+\\.)*(([a-z]+)|\\(none\\))$"
                         },
                         "minItems": 1
                     },