diff --git a/runtime/lua/vim/filetype.lua b/runtime/lua/vim/filetype.lua
index f17a3d042d..501a38856d 100644
--- a/runtime/lua/vim/filetype.lua
+++ b/runtime/lua/vim/filetype.lua
@@ -296,6 +296,7 @@ local extension = {
   cdl = 'cdl',
   toc = detect_line1('\\contentsline', 'tex', 'cdrtoc'),
   cedar = 'cedar',
+  cel = 'cel',
   cfc = 'cf',
   cfm = 'cf',
   cfi = 'cf',
diff --git a/test/old/testdir/test_filetype.vim b/test/old/testdir/test_filetype.vim
index faede101ba..ed23301307 100644
--- a/test/old/testdir/test_filetype.vim
+++ b/test/old/testdir/test_filetype.vim
@@ -171,6 +171,7 @@ func s:GetFilenameChecks() abort
     \ 'cdrdaoconf': ['/etc/cdrdao.conf', '/etc/defaults/cdrdao', '/etc/default/cdrdao', '.cdrdao', 'any/etc/cdrdao.conf', 'any/etc/default/cdrdao', 'any/etc/defaults/cdrdao'],
     \ 'cdrtoc': ['file.toc'],
     \ 'cedar': ['file.cedar'],
+    \ 'cel': ['file.cel'],
     \ 'cf': ['file.cfm', 'file.cfi', 'file.cfc'],
     \ 'cfengine': ['cfengine.conf'],
     \ 'cfg': ['file.hgrc', 'filehgrc', 'hgrc', 'some-hgrc'],