1 files changed, 16 insertions, 1 deletions

diff --git a/src/coding.c b/src/coding.c
index 19d9ebfc68c..9b295d7d870 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -7835,6 +7835,7 @@ usage: (define-coding-system-internal ...)  */)
 
   if (EQ (coding_type, Qcharset))
     {
+      Lisp_Object list;
       /* Generate a lisp vector of 256 elements.  Each element is nil,
          integer, or a list of charset IDs.
 
@@ -7848,9 +7849,23 @@ usage: (define-coding-system-internal ...)  */)
          of one of them.  The list is sorted by dimensions of the
          charsets.  A charset of smaller dimension comes firtst.
       */
+      for (list = Qnil, tail = charset_list; CONSP (tail); tail = XCDR (tail))
+        {
+          struct charset *charset = CHARSET_FROM_ID (XFASTINT (XCAR (tail)));
+
+          if (charset->method == CHARSET_METHOD_SUPERSET)
+            {
+              val = CHARSET_SUPERSET (charset);
+              for (; CONSP (val); val = XCDR (val))
+                list = Fcons (XCAR (XCAR (val)), list); 
+            }
+          else
+            list = Fcons (XCAR (tail), list);
+        }
+
       val = Fmake_vector (make_number (256), Qnil);
 
-      for (tail = charset_list; CONSP (tail); tail = XCDR (tail))
+      for (tail = Fnreverse (list); CONSP (tail); tail = XCDR (tail))
         {
           struct charset *charset = CHARSET_FROM_ID (XFASTINT (XCAR (tail)));
           int dim = CHARSET_DIMENSION (charset);