diff --git a/src/shared/util.js b/src/shared/util.js
index d0df815d5..4080818d4 100644
--- a/src/shared/util.js
+++ b/src/shared/util.js
@@ -641,7 +641,7 @@ class FeatureTest {
   }
 }
 
-const hexNumbers = [...Array(256).keys()].map(n =>
+const hexNumbers = Array.from(Array(256).keys(), n =>
   n.toString(16).padStart(2, "0")
 );