diff --git a/runtime/syntax/upstart.vim b/runtime/syntax/upstart.vim
index b3f2b9e..140cd17 100644
--- a/runtime/syntax/upstart.vim
+++ b/runtime/syntax/upstart.vim
@@ -10,9 +10,8 @@
 " It is inspired by the initng syntax file and includes sh.vim to do the
 " highlighting of script blocks.
 
-if version < 600
-	syntax clear
-elseif exists("b:current_syntax")
+" quit when a syntax file was already loaded
+if exists("b:current_syntax")
 	finish
 endif