diff --git a/lib/6to5/transformation/transform.js b/lib/6to5/transformation/transform.js
index fb7f049f8f..03a9128292 100644
--- a/lib/6to5/transformation/transform.js
+++ b/lib/6to5/transformation/transform.js
@@ -83,14 +83,14 @@ _.each({
 
   _declarations:             require("./transformers/_declarations"),
 
-  coreAliasing:              require("./transformers/optional-core-aliasing"),
-  undefinedToVoid:           require("./transformers/optional-undefined-to-void"),
-
   // wrap up
   _aliasFunctions:           require("./transformers/_alias-functions"),
   _moduleFormatter:          require("./transformers/_module-formatter"),
   useStrict:                 require("./transformers/use-strict"),
 
+  coreAliasing:              require("./transformers/optional-core-aliasing"),
+  undefinedToVoid:           require("./transformers/optional-undefined-to-void"),
+
   // spec
   specPropertyLiterals:         require("./transformers/spec-property-literals"),
   specMemberExpressionLiterals: require("./transformers/spec-member-expression-literals")