diff --git a/app/utils/to-electron-background-color.ts b/app/utils/to-electron-background-color.ts
index 1a526534099f..fc4a97991192 100644
--- a/app/utils/to-electron-background-color.ts
+++ b/app/utils/to-electron-background-color.ts
@@ -13,5 +13,5 @@ export default (bgColor: string) => {
 
   // http://stackoverflow.com/a/11019879/1202488
   const alphaHex = Math.round(color.alpha() * 255).toString(16);
-  return `#${alphaHex}${color.hex().toString().substr(1)}`;
+  return `#${alphaHex}${color.hex().toString().slice(1)}`;
 };