diff --git a/ftdetect/arm.vim b/ftdetect/arm.vim
index ba86b1a..df5dcbc 100644
--- a/ftdetect/arm.vim
+++ b/ftdetect/arm.vim
@@ -1 +1,2 @@
-au BufRead *.([sS]|lst) call arm#ft#FTarm()
+au BufRead *.[sS] call arm#ft#FTarm()
+au BufRead *.lst call arm#ft#FTarm()