diff --git a/apps/desktop/electron/main.ts b/apps/desktop/electron/main.ts
index deb5ed49fd..1da6d948a2 100644
--- a/apps/desktop/electron/main.ts
+++ b/apps/desktop/electron/main.ts
@@ -7369,6 +7369,13 @@ function installContextMenuBridge(window: BrowserWindow) {
 // usage strings), so the user keeps a real allow/deny and can revoke it in
 // System Settings afterwards.
 function isMediaCapturePermission(permission, details) {
+  // HTML5 video/audio fullscreen asks the request handler for 'fullscreen'
+  // and the check handler for 'automatic-fullscreen'. Both must be allowed
+  // or the native fullscreen button on <video controls> does nothing.
+  if (permission === 'fullscreen' || permission === 'automatic-fullscreen') {
+    return true
+  }
+
   if (permission === 'audioCapture' || permission === 'videoCapture') {
     return true
   }
@@ -7431,6 +7438,7 @@ function installMediaPermissions() {
   session.defaultSession.setPermissionCheckHandler((_webContents, permission) => {
     return (
       permission === 'media' ||
+      permission === 'automatic-fullscreen' ||
       permission === ('audioCapture' as any) /* todo: is this needed? */ ||
       permission === ('videoCapture' as any)
     )