--- a/mobile/android/base/java/org/mozilla/gecko/webapps/WebAppManifest.java
+++ b/mobile/android/base/java/org/mozilla/gecko/webapps/WebAppManifest.java
@@ -168,31 +168,38 @@ public class WebAppManifest {
         final LoadFaviconResult loadIconResult = FaviconDecoder
             .decodeDataURI(GeckoAppShell.getApplicationContext(), iconStr);
         if (loadIconResult == null) {
             return null;
         }
         return loadIconResult.getBestBitmap(GeckoAppShell.getPreferredIconSize());
     }
 
+    private static Uri stripPath(final Uri uri) {
+        return new Uri.Builder()
+            .scheme(uri.getScheme())
+            .authority(uri.getAuthority())
+            .build();
+    }
+
     private static Uri stripLastPathSegment(final Uri uri) {
         final Uri.Builder builder = new Uri.Builder()
             .scheme(uri.getScheme())
             .authority(uri.getAuthority());
 
         final List<String> segments = uri.getPathSegments();
         for (int i = 0; i < (segments.size() - 1); i++) {
             builder.appendPath(segments.get(i));
         }
 
         return builder.build();
     }
 
     private Uri readScope(final JSONObject manifest) {
-        final Uri defaultScope = stripLastPathSegment(mStartUri);
+        final Uri defaultScope = stripPath(mStartUri);
         final String scopeStr = manifest.optString("scope", null);
         if (scopeStr == null) {
             return defaultScope;
         }
 
         Uri scope = Uri.parse(scopeStr);
         if (scope == null) {
             return defaultScope;