diff --git a/static/btcmap.webmanifest b/static/btcmap.webmanifest
index 17885e62..8da453da 100644
--- a/static/btcmap.webmanifest
+++ b/static/btcmap.webmanifest
@@ -6,12 +6,14 @@
 		{
 			"src": "/android-chrome-192x192.png",
 			"sizes": "192x192",
-			"type": "image/png"
+			"type": "image/png",
+			"purpose": "any"
 		},
 		{
 			"src": "/android-chrome-512x512.png",
 			"sizes": "512x512",
-			"type": "image/png"
+			"type": "image/png",
+			"purpose": "any"
 		},
 		{
 			"src": "/apple-touch-icon.png",