diff --git a/ftdetect/rmarkdown.vim b/ftdetect/rmarkdown.vim
index 6d6eafa..7dba398 100644
--- a/ftdetect/rmarkdown.vim
+++ b/ftdetect/rmarkdown.vim
@@ -1,3 +1,3 @@
 augroup rmarkdown
-    au! BufRead,BufNewFile *.Rmd  setfiletype rmarkdown
+    au! BufRead,BufNewFile *.Rmd  set filetype=rmarkdown
 augroup END