diff --git a/transforms/module.js b/transforms/module.js
index ae2d5c2bb3..101b82cc4f 100644
--- a/transforms/module.js
+++ b/transforms/module.js
@@ -157,7 +157,9 @@ module.exports = function(info, api) {
       })
       .replaceWith(path => {
         const name = `${path.value.object.name}.${path.value.property.name}`;
-        return j.literal(defines[name]);
+        const expression = j.literal(defines[name]);
+        expression.comments = path.value.comments;
+        return expression;
       });
 
   // remove goog.provide()
@@ -232,10 +234,18 @@ module.exports = function(info, api) {
   Object.keys(replacements).sort().reverse().forEach(name => {
     if (name.indexOf('.') > 0) {
       root.find(j.MemberExpression, getMemberExpression(name))
-          .replaceWith(j.identifier(replacements[name]));
+          .replaceWith(path => {
+            const expression = j.identifier(replacements[name]);
+            expression.comments = path.value.comments;
+            return expression;
+          });
     } else {
       root.find(j.Identifier, {name: name})
-          .replaceWith(j.identifier(replacements[name]));
+          .replaceWith(path => {
+            const identifier = j.identifier(replacements[name]);
+            identifier.comments = path.value.comments;
+            return identifier;
+          });
     }
   });