diff --git a/syntax/json.vim b/syntax/json.vim
index c3a1ea5..25a462d 100644
--- a/syntax/json.vim
+++ b/syntax/json.vim
@@ -1,5 +1,8 @@
-if exists("b:current_syntax")
-  finish
+if !exists("main_syntax")
+  if exists("b:current_syntax")
+    finish
+  endif
+  let main_syntax = 'json'
 endif
 
 syn cluster jsonValue contains=jsonString,jsonNumber,jsonObject,jsonArray,jsonBoolean,jsonNull
@@ -31,3 +34,6 @@ hi default link jsonColon Delimiter
 hi default link jsonComma Delimiter
 
 let b:current_syntax = 'json'
+if main_syntax == 'json'
+  unlet main_syntax
+endif