Index: b/lib/encoding.c

===================================================================

--- a/lib/encoding.c

+++ b/lib/encoding.c

@@ -538,7 +538,9 @@

     {

       /* Find if there is a substitute for that font */

       res = pair_get (encoding->substitutes, font_name);

-      if (!res)

+      if (res)

+	res = xstrdup (res);

+      else

 	/* No. Check if this font is supported */

 	if (font_exists (job, font_name))

 	  /* Avoid returning sth alloca'd */