diff --git a/src/utils.ts b/src/utils.ts
index 3c4ffba..0245a2f 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -89,7 +89,7 @@ function getRootFiberNodeFromDOM(startElement?: Element): FiberNode | null {
   }
 
   let returnFiberNode = null;
-  for (const childNode of startElement.children) {
+  for (const childNode of [].slice.call(startElement.children)) {
     returnFiberNode = getRootFiberNodeFromDOM(childNode);
     if (returnFiberNode !== null) {
       return returnFiberNode;
diff --git a/tsconfig.base.json b/tsconfig.base.json
index 206d0c1..bb8e9b7 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -17,7 +17,8 @@
     "removeComments": true,
     "sourceMap": true,
     "strict": true,
-    "target": "es6"
+    "target": "es5",
+    "downlevelIteration": true
   },
   "exclude": ["node_modules", "dist"],
   "include": ["src"]