diff --git a/manifest.json b/manifest.json
index 07a9bd4..17afd69 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,7 +6,8 @@
 	"icons": [
 		{
 			"src": "icon.svg",
-			"sizes": "any"
+			"sizes": "any",
+			"purpose": "maskable",
 		}
 	],
 	"start_url": "/mcalc/index.html",