diff --git a/after/syntax/tex.vim b/after/syntax/tex.vim
index f54f647..e213012 100644
--- a/after/syntax/tex.vim
+++ b/after/syntax/tex.vim
@@ -4,8 +4,11 @@
 " Email:      karl.yngve@gmail.com
 "
 
-if exists('b:current_syntax') | finish | endif
-let b:current_syntax = 'tex'
+if !exists('b:current_syntax')
+  let b:current_syntax = 'tex'
+elseif b:current_syntax !=# 'tex'
+  finish
+endif
 
 " Perform spell checking when there is no syntax
 " - This will enable spell checking e.g. in toplevel of included files