-au BufNewFile,BufRead *.scheme setf scheme
-au BufNewFile,BufRead *.sig setf sml
-au BufNewFile,BufRead *.cabal setf cabal
+au BufNewFile,BufRead *.scheme set filetype=scheme
+au BufNewFile,BufRead *.sig set filetype=sml
+au BufNewFile,BufRead *.cabal set filetype=cabal