--- lib/names.c
+++ lib/names.c
@@ -478,7 +478,7 @@
       return format_name_pair(buf, size, flags, v, d, numbuf);
     case PCI_LOOKUP_CLASS:
       icls = va_arg(args, int);
-      sprintf(numbuf, "%04x", icls);
+      sprintf(numbuf, "Class %04x", icls);
       cls = id_lookup(a, ID_SUBCLASS, icls >> 8, icls & 0xff, 0, 0);
       if (!cls && (cls = id_lookup(a, ID_CLASS, icls >> 8, 0, 0, 0)))
 	{