diff --git a/tsconfig.json b/tsconfig.json
index 83a96ee..ebdff96 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,6 +3,7 @@
     "target": "es5",
     "module": "esnext",
     "declaration": true,
+    "downlevelIteration": true,
     "jsx": "preserve",
     "importHelpers": true,
     "moduleResolution": "node",