diff --git a/runtime/ftplugin/masm.vim b/runtime/ftplugin/masm.vim
new file mode 100644
index 0000000..235469a
--- /dev/null
+++ b/runtime/ftplugin/masm.vim
@@ -0,0 +1,19 @@
+" Vim filetype plugin file
+" Language:	Microsoft Macro Assembler (80x86)
+" Maintainer:	Wu Yongwei <wuyongwei@gmail.com>
+" Last Change:	2020-05-09 23:02:05 +0800
+
+if exists("b:did_ftplugin")
+  finish
+endif
+let b:did_ftplugin = 1
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+let b:undo_ftplugin = "setl iskeyword<"
+
+setlocal iskeyword=@,48-57,_,36,60,62,63,@-@
+
+let &cpo = s:cpo_save
+unlet s:cpo_save