diff --git a/runtime/ftplugin/eruby.vim b/runtime/ftplugin/eruby.vim
index 8b189df..802f596 100644
--- a/runtime/ftplugin/eruby.vim
+++ b/runtime/ftplugin/eruby.vim
@@ -27,7 +27,7 @@
   let s:lines = getline(1)."\n".getline(2)."\n".getline(3)."\n".getline(4)."\n".getline(5)."\n".getline("$")
   let b:eruby_subtype = matchstr(s:lines,'eruby_subtype=\zs\w\+')
   if b:eruby_subtype == ''
-    let b:eruby_subtype = matchstr(substitute(expand("%:t"),'\c\%(\.erb\)\+$','',''),'\.\zs\w\+$')
+    let b:eruby_subtype = matchstr(substitute(expand("%:t"),'\c\%(\.erb\|\.eruby\)\+$','',''),'\.\zs\w\+$')
   endif
   if b:eruby_subtype == 'rhtml'
     let b:eruby_subtype = 'html'