diff --git a/lisp/international/mule-conf.el b/lisp/international/mule-conf.el
index d6de9dfbe21..5abef2e6b45 100644
--- a/lisp/international/mule-conf.el
+++ b/lisp/international/mule-conf.el
@@ -427,6 +427,7 @@
 
 (define-charset 'cp932-2-byte
   "2-byte part of CP932"
+  :dimension 2
   :map "CP932-2BYTE"
   :code-space [#x00 #xFF #x00 #xFE]
   :supplementary-p t)