diff --git a/contrib/syntax/vim/ftdetect/dockerfile.vim b/contrib/syntax/vim/ftdetect/dockerfile.vim
index f7a962e073..a21dd14095 100644
--- a/contrib/syntax/vim/ftdetect/dockerfile.vim
+++ b/contrib/syntax/vim/ftdetect/dockerfile.vim
@@ -1 +1 @@
-au BufNewFile,BufRead [Dd]ockerfile,Dockerfile.*,*.Dockerfile set filetype=dockerfile
+au BufNewFile,BufRead [Dd]ockerfile,[Dd]ockerfile.*,*.[Dd]ockerfile set filetype=dockerfile