diff --git a/runtime/syntax/b.vim b/runtime/syntax/b.vim
index e976691..7f6c4e8 100644
--- a/runtime/syntax/b.vim
+++ b/runtime/syntax/b.vim
@@ -137,6 +137,6 @@
   delcommand HiLink
 endif
 
-let current_syntax = "b"
+let b:current_syntax = "b"
 
 " vim: ts=8