diff --git a/copyparty/web/baguettebox.js b/copyparty/web/baguettebox.js
index 4b132a49..c1668951 100644
--- a/copyparty/web/baguettebox.js
+++ b/copyparty/web/baguettebox.js
@@ -36,7 +36,7 @@ window.baguetteBox = (function () {
         touchFlag = false,  // busy
         scrollCSS = ['', ''],
         scrollTimer = 0,
-        re_i = /^[^?]+\.(a?png|avif|bmp|gif|heif|jpe?g|jfif|svg|webp)(\?|$)/i,
+        re_i = /^[^?]+\.(a?png|avif|bmp|gif|heif|jfif|jpe?g|svg|tiff?|webp)(\?|$)/i,
         re_v = /^[^?]+\.(webm|mkv|mp4|m4v|mov)(\?|$)/i,
         re_cbz = /^[^?]+\.(cbz)(\?|$)/i,
         cbz_pics = ["png", "jpg", "jpeg", "gif", "bmp", "tga", "tif", "tiff", "webp", "avif"],