diff --git a/runtime/lua/vim/filetype.lua b/runtime/lua/vim/filetype.lua
index 214e95798f..f23f723a9d 100644
--- a/runtime/lua/vim/filetype.lua
+++ b/runtime/lua/vim/filetype.lua
@@ -557,6 +557,7 @@ local extension = {
   persistentmodels = 'haskellpersistent',
   ht = 'haste',
   htpp = 'hastepreproc',
+  hx = 'haxe',
   hcl = 'hcl',
   hb = 'hb',
   h = detect.header,
diff --git a/test/old/testdir/test_filetype.vim b/test/old/testdir/test_filetype.vim
index 3c2eff2575..e4981acce8 100644
--- a/test/old/testdir/test_filetype.vim
+++ b/test/old/testdir/test_filetype.vim
@@ -348,6 +348,7 @@ func s:GetFilenameChecks() abort
     \ 'haskellpersistent': ['file.persistentmodels'],
     \ 'haste': ['file.ht'],
     \ 'hastepreproc': ['file.htpp'],
+    \ 'haxe': ['file.hx'],
     \ 'hb': ['file.hb'],
     \ 'hcl': ['file.hcl'],
     \ 'heex': ['file.heex'],