diff --git a/src/babel/traversal/scope.js b/src/babel/traversal/scope.js
index 01358c709d..87addd8627 100644
--- a/src/babel/traversal/scope.js
+++ b/src/babel/traversal/scope.js
@@ -449,7 +449,7 @@ export default class Scope {
     if (path.isLoop()) {
       for (let i = 0; i < t.FOR_INIT_KEYS.length; i++) {
         var node = path.get(t.FOR_INIT_KEYS[i]);
-        if (node.isBlockScoped()) this.registerBinding("let", node);
+        if (node.isBlockScoped()) this.registerBinding(node.node.kind, node);
       }
     }
 
diff --git a/test/core/fixtures/transformation/es6.constants/loop/actual.js b/test/core/fixtures/transformation/es6.constants/loop/actual.js
new file mode 100644
index 0000000000..2bef733ec1
--- /dev/null
+++ b/test/core/fixtures/transformation/es6.constants/loop/actual.js
@@ -0,0 +1,3 @@
+for (const i = 0; i < 3; i = i + 1) {
+  console.log(i);
+}
diff --git a/test/core/fixtures/transformation/es6.constants/loop/options.json b/test/core/fixtures/transformation/es6.constants/loop/options.json
new file mode 100644
index 0000000000..81e76d393f
--- /dev/null
+++ b/test/core/fixtures/transformation/es6.constants/loop/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Duplicate declaration \"i\""
+}