diff --git a/lib/6to5/patch.js b/lib/6to5/patch.js
index b20d9d1d38..99441c83c1 100644
--- a/lib/6to5/patch.js
+++ b/lib/6to5/patch.js
@@ -34,9 +34,9 @@ def("ImportBatchSpecifier")
   .field("name", def("Identifier"));
 
 def("RestElement")
-  .bases("Node")
+  .bases("Pattern")
   .build("argument")
-  .field("argument", def("Pattern"));
+  .field("argument", def("expression"));
 
 // Abstract references
 def("VirtualPropertyExpression")