diff --git a/modules/BlueskyNSE/NotificationService.swift b/modules/BlueskyNSE/NotificationService.swift
index eaf85924df..96ca79a391 100644
--- a/modules/BlueskyNSE/NotificationService.swift
+++ b/modules/BlueskyNSE/NotificationService.swift
@@ -118,11 +118,19 @@ class NotificationService: UNNotificationServiceExtension {
   }
 
   func downloadAvatarImage(from urlString: String) -> INImage? {
-    let thumbnailUrlString = urlString.replacingOccurrences(
+    var thumbnailUrlString = urlString.replacingOccurrences(
       of: "/img/avatar/",
       with: "/img/avatar_thumbnail/"
     )
 
+    // CDN URLs may end with @webp or no extension (which defaults to webp).
+    // INImage doesn't reliably handle WebP, so force JPEG.
+    if let atRange = thumbnailUrlString.range(of: "@", options: .backwards) {
+      thumbnailUrlString = String(thumbnailUrlString[..<atRange.lowerBound]) + "@jpeg"
+    } else {
+      thumbnailUrlString += "@jpeg"
+    }
+
     guard let url = URL(string: thumbnailUrlString) else { return nil }
 
     var request = URLRequest(url: url)