diff --git a/copyparty/web/baguettebox.js b/copyparty/web/baguettebox.js
index 472ccf66..870f1fc7 100644
--- a/copyparty/web/baguettebox.js
+++ b/copyparty/web/baguettebox.js
@@ -32,7 +32,7 @@ window.baguetteBox = (function () {
         scrollCSS = ['', ''],
         scrollTimer = 0,
         re_i = /^[^?]+\.(a?png|avif|bmp|gif|heif|jpe?g|jfif|svg|webp)(\?|$)/i,
-        re_v = /^[^?]+\.(webm|mkv|mp4)(\?|$)/i,
+        re_v = /^[^?]+\.(webm|mkv|mp4|m4v)(\?|$)/i,
         anims = ['slideIn', 'fadeIn', 'none'],
         data = {},  // all galleries
         imagesElements = [],
diff --git a/copyparty/web/browser.js b/copyparty/web/browser.js
index ac53db8b..517870db 100644
--- a/copyparty/web/browser.js
+++ b/copyparty/web/browser.js
@@ -1,7 +1,7 @@
 "use strict";
 
 var XHR = XMLHttpRequest,
-	img_re = /\.(a?png|avif|bmp|gif|heif|jpe?g|jfif|svg|webp|webm|mkv|mp4)(\?|$)/i;
+	img_re = /\.(a?png|avif|bmp|gif|heif|jpe?g|jfif|svg|webp|webm|mkv|mp4|m4v)(\?|$)/i;
 
 var Ls = {
 	"eng": {