diff --git a/runtime/lua/vim/filetype.lua b/runtime/lua/vim/filetype.lua
index 65330d9777..b83acab20c 100644
--- a/runtime/lua/vim/filetype.lua
+++ b/runtime/lua/vim/filetype.lua
@@ -614,6 +614,7 @@ local extension = {
   module = detect.hw,
   pkg = detect.hw,
   hy = 'hy',
+  hylo = 'hylo',
   iba = 'ibasic',
   ibi = 'ibasic',
   icn = 'icon',
diff --git a/test/old/testdir/test_filetype.vim b/test/old/testdir/test_filetype.vim
index a7772c430d..132ab80bd6 100644
--- a/test/old/testdir/test_filetype.vim
+++ b/test/old/testdir/test_filetype.vim
@@ -380,6 +380,7 @@ func s:GetFilenameChecks() abort
     \ 'http': ['file.http'],
     \ 'hurl': ['file.hurl'],
     \ 'hy': ['file.hy', '.hy-history'],
+    \ 'hylo': ['file.hylo'],
     \ 'hyprlang': ['hyprlock.conf', 'hyprland.conf', 'hypridle.conf', 'hyprpaper.conf', '/hypr/foo.conf'],
     \ 'i3config': ['/home/user/.i3/config', '/home/user/.config/i3/config', '/etc/i3/config', '/etc/xdg/i3/config'],
     \ 'ibasic': ['file.iba', 'file.ibi'],