diff --git a/lib/6to5/traverse/scope.js b/lib/6to5/traverse/scope.js
index b8e61e7510..cdaee0f2df 100644
--- a/lib/6to5/traverse/scope.js
+++ b/lib/6to5/traverse/scope.js
@@ -179,13 +179,13 @@ Scope.prototype.getInfo = function () {
 
   var info = block._scopeInfo = {};
 
-  var bindings         = info.bindings     = object();
+  var bindings         = info.bindings         = object();
   var references       = info.references       = object();
   var types            = info.types            = object();
   var declarationKinds = info.declarationKinds = {
-    "var": object(),
-    "let": object(),
-    "const": object()
+    "const": object(),
+    "var":   object(),
+    "let":   object()
   };
 
   var add = function (node, reference) {
@@ -195,8 +195,14 @@ Scope.prototype.getInfo = function () {
 
     if (!reference) {
       for (var key in ids) {
+        var id = ids[key];
+
+        if (id.typeAnnotation) {
+          types[id] = id.typeAnnotation;
+        }
+
         if (declarationKinds["let"][key] || declarationKinds["const"][key]) {
-          throw self.file.errorWithNode(ids[key], "Duplicate declaration " + key, TypeError);
+          throw self.file.errorWithNode(id, "Duplicate declaration " + key, TypeError);
         }
       }