diff --git a/runtime/syntax/coco.vim b/runtime/syntax/coco.vim
index 4094a55..ae32348 100644
--- a/runtime/syntax/coco.vim
+++ b/runtime/syntax/coco.vim
@@ -5,9 +5,8 @@
 " Remark:       Coco/R syntax partially implemented.
 " License:      Vim license
 
-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