diff --git a/ftdetect/arm.vim b/ftdetect/arm.vim
index aa022de..ba86b1a 100644
--- a/ftdetect/arm.vim
+++ b/ftdetect/arm.vim
@@ -1 +1 @@
-au BufRead *.[sS]  call arm#ft#FTarm()
+au BufRead *.([sS]|lst) call arm#ft#FTarm()