diff --git a/lisp/textmodes/sgml-mode.el b/lisp/textmodes/sgml-mode.el
index f3d8695e24..92a2215ed7 100644
--- a/lisp/textmodes/sgml-mode.el
+++ b/lisp/textmodes/sgml-mode.el
@@ -193,7 +193,7 @@ sgml-mode-syntax-table
 
 (defconst sgml-tag-syntax-table
   (let ((table (sgml-make-syntax-table sgml-specials)))
-    (dolist (char '(?\( ?\) ?\{ ?\} ?\[ ?\] ?$ ?% ?& ?* ?+ ?/))
+    (dolist (char '(?\( ?\) ?\{ ?\} ?\[ ?\] ?$ ?% ?& ?* ?+ ?/ ?（))
       (modify-syntax-entry char "." table))
     (unless (memq ?' sgml-specials)
       ;; Avoid that skipping a tag backwards skips any "'" prefixing it.