diff --git a/controllers/index.go b/controllers/index.go
index f2beb3b93..b632df41d 100644
--- a/controllers/index.go
+++ b/controllers/index.go
@@ -73,8 +73,8 @@ func renderIndexHtml(w http.ResponseWriter, nonce string) {
 		Summary:          data.GetServerSummary(),
 		RequestedURL:     data.GetServerURL(),
 		TagsString:       strings.Join(data.GetServerMetadataTags(), ","),
-		ThumbnailURL:     "/thumbnail",
-		Thumbnail:        "/thumbnail",
+		ThumbnailURL:     "/thumbnail.jpg",
+		Thumbnail:        "/thumbnail.jpg",
 		Image:            "/logo/external",
 		StatusJSON:       string(sb),
 		ServerConfigJSON: string(cb),