diff --git a/modules/benchmarks/src/tree/ng2/init.ts b/modules/benchmarks/src/tree/ng2/init.ts
index 309db9dd6d..58c0269ce1 100644
--- a/modules/benchmarks/src/tree/ng2/init.ts
+++ b/modules/benchmarks/src/tree/ng2/init.ts
@@ -29,7 +29,7 @@ export function init(moduleRef: NgModuleRef<AppModule>) {
   }
 
   function detectChanges() {
-    for (var i = 0; i < 10; i++) {
+    for (let i = 0; i < 10; i++) {
       appRef.tick();
     }
     detectChangesRuns += 10;