diff --git a/app/template.html b/app/template.html
index 5224a7c..4ed9903 100644
--- a/app/template.html
+++ b/app/template.html
@@ -12,8 +12,8 @@
 	<link rel='icon' type='image/png' href='favicon.png'>
 
 	<script>
-		(window.Promise && [].includes && Object.assign && window.Map) ||
-		document.write('<script src="https://cdn.polyfill.io/v2/polyfill.min.js"><\/script>');
+		(window.Promise && [].includes && Object.assign && window.Map && window.fetch) ||
+		document.write('<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=default,fetch"><\/script>');
 	</script>
 
 	<!-- Sapper generates a <style> tag containing critical CSS