diff --git a/conf/smr.conf b/conf/smr.conf
index 7693d17..9c960a8 100644
--- a/conf/smr.conf
+++ b/conf/smr.conf
@@ -77,7 +77,7 @@ domain * {
 		validate pass v_any
 	}
 	params post /_claim {
-		validate user v_any
+		validate user v_subdomain
 	}
 
 }