diff -up a2ps-4.14/lib/encoding.c.bad-free a2ps-4.14/lib/encoding.c

--- a2ps-4.14/lib/encoding.c.bad-free	2013-04-30 11:49:50.511962062 +0100

+++ a2ps-4.14/lib/encoding.c	2013-04-30 11:52:18.682573468 +0100

@@ -541,7 +541,9 @@ encoding_resolve_font_substitute (struct

     {

       /* 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 */