diff --git a/entry.js b/entry.js
index 1345d8b1f..a81570398 100644
--- a/entry.js
+++ b/entry.js
@@ -1,3 +1,4 @@
+import polyfill from "terriajs/lib/Core/polyfill";
 import globeGif from "./lib/Styles/globe.gif";
 import "./lib/Styles/loader.css";
 
@@ -42,16 +43,18 @@ function createLoader() {
   loaderDiv.style.backgroundColor = "#383F4D";
   document.body.appendChild(loaderDiv);
 
-  loadMainScript()
-    .catch(() => {
-      // Ignore errors and try to show the map anyway
-    })
-    .then(() => {
-      loaderDiv.classList.add("loader-ui-hide");
-      setTimeout(() => {
-        document.body.removeChild(loaderDiv);
-      }, 2000);
-    });
+  polyfill(() =>
+    loadMainScript()
+      .catch(() => {
+        // Ignore errors and try to show the map anyway
+      })
+      .then(() => {
+        loaderDiv.classList.add("loader-ui-hide");
+        setTimeout(() => {
+          document.body.removeChild(loaderDiv);
+        }, 2000);
+      })
+  );
 }
 
 createLoader();