diff --git a/runtime/lua/vim/filetype.lua b/runtime/lua/vim/filetype.lua
index f23f723a9d..84322142d0 100644
--- a/runtime/lua/vim/filetype.lua
+++ b/runtime/lua/vim/filetype.lua
@@ -871,6 +871,7 @@ local extension = {
   nsh = 'nsis',
   nt = 'ntriples',
   nu = 'nu',
+  nbt = 'numbat',
   obj = 'obj',
   objdump = 'objdump',
   cppobjdump = 'objdump',
diff --git a/test/old/testdir/test_filetype.vim b/test/old/testdir/test_filetype.vim
index e4981acce8..b08eee9138 100644
--- a/test/old/testdir/test_filetype.vim
+++ b/test/old/testdir/test_filetype.vim
@@ -564,6 +564,7 @@ func s:GetFilenameChecks() abort
     \ 'nsis': ['file.nsi', 'file.nsh'],
     \ 'ntriples': ['file.nt'],
     \ 'nu': ['file.nu'],
+    \ 'numbat': ['file.nbt'],
     \ 'obj': ['file.obj'],
     \ 'objdump': ['file.objdump', 'file.cppobjdump'],
     \ 'obse': ['file.obl', 'file.obse', 'file.oblivion', 'file.obscript'],