diff --git a/static/manifest.json b/static/manifest.json
index 0ff56f7..216fe7c 100644
--- a/static/manifest.json
+++ b/static/manifest.json
@@ -34,42 +34,42 @@
     {
       "src": "/images/screenshots/narrow-home.png",
       "type": "image/png",
-      "sizes": "any",
+      "sizes": "720x1480",
       "form_factor": "narrow",
       "label": "Homescreen of OwlBoard"
     },
     {
       "src": "/images/screenshots/narrow-ldbs.png",
       "type": "image/png",
-      "sizes": "any",
+      "sizes": "720x1480",
       "form_factor": "narrow",
       "label": "Live rail departure boards"
     },
     {
       "src": "/images/screenshots/narrow-timetable.png",
       "type": "image/png",
-      "sizes": "any",
+      "sizes": "720x1480",
       "form_factor": "narrow",
       "label": "Train details and PIS Codes"
     },
     {
       "src": "/images/screenshots/wide-home.png",
       "type": "image/png",
-      "sizes": "any",
+      "sizes": "2560x1600",
       "form_factor": "wide",
       "label": "Homescreen of OwlBoard"
     },
     {
       "src": "/images/screenshots/wide-ldbs.png",
       "type": "image/png",
-      "sizes": "any",
+      "sizes": "2560x1600",
       "form_factor": "wide",
       "label": "Live rail departure boards"
     },
     {
       "src": "/images/screenshots/wide-timetable.png",
       "type": "image/png",
-      "sizes": "any",
+      "sizes": "2560x1600",
       "form_factor": "wide",
       "label": "Train details and PIS Codes"
     }