diff --git a/schemas/domain.schema.json b/schemas/domain.schema.json
index 143e87b3..0c571d88 100644
--- a/schemas/domain.schema.json
+++ b/schemas/domain.schema.json
@@ -21,7 +21,7 @@
     },
     "subdomain": {
       "type": "string",
-      "pattern": "^([a-z0-9_*.-]{2,64}|@)$",
+      "pattern": "^([a-z0-9_*.-]{1,64}|@)$",
       "not": {
         "enum": [
           "a11y",