diff --git a/lib/6to5/templates/tagged-template-literal.js b/lib/6to5/templates/tagged-template-literal.js
index 9d3b26a3b7..a1735f0fc7 100644
--- a/lib/6to5/templates/tagged-template-literal.js
+++ b/lib/6to5/templates/tagged-template-literal.js
@@ -1,4 +1,4 @@
 (function (strings, raw) {
-  return Object.defineProperties(strings, { raw: { value: raw } });
+  return Object.freeze(Object.defineProperties(strings, { raw: { value: raw } }));
 });
 
diff --git a/test/fixtures/transformation/es6-template-literals/tag/expected.js b/test/fixtures/transformation/es6-template-literals/tag/expected.js
index 9992ad8f15..6d6de74206 100644
--- a/test/fixtures/transformation/es6-template-literals/tag/expected.js
+++ b/test/fixtures/transformation/es6-template-literals/tag/expected.js
@@ -1,11 +1,11 @@
 "use strict";
 
 var _taggedTemplateLiteral = function (strings, raw) {
-  return Object.defineProperties(strings, {
+  return Object.freeze(Object.defineProperties(strings, {
     raw: {
       value: raw
     }
-  });
+  }));
 };
 
 var foo = bar(_taggedTemplateLiteral(["wow\na", "b ", ""], ["wow\\na", "b ", ""]), 42, _.foobar());