diff --git a/syntax/quox.vim b/syntax/quox.vim
index df6590e..fe122d9 100644
--- a/syntax/quox.vim
+++ b/syntax/quox.vim
@@ -1,5 +1,9 @@
-set isk+=-,#
+if exists('b:current_syntax')
+  finish
+endif
+let b:current_syntax = 'quox'
 
+set isk+=-,#
 
 syn match quoxDelim /[\[\](){};]/
 syn match quoxDelim /\<_\>/