diff --git a/stdlib/public/core/ErrorType.swift b/stdlib/public/core/ErrorType.swift
index 5c5c2224fa98b..a82e0fb6d8323 100644
--- a/stdlib/public/core/ErrorType.swift
+++ b/stdlib/public/core/ErrorType.swift
@@ -278,7 +278,7 @@ extension Error {
   }
 
   public var _domain: String {
-    return String(reflecting: type(of: self))
+    return _typeName(type(of: self), qualified: true)
   }
 
   public var _userInfo: AnyObject? {