diff --git a/lib/lib.pl b/lib/lib.pl
index f5502b96..c854ab9f 100755
--- a/lib/lib.pl
+++ b/lib/lib.pl
@@ -46,14 +46,16 @@ print "\t\t*required &= present;";
 print "\tcase GLIBTOP_ERROR_METHOD_WARN:";
 print "\t\tglibtop_warn_r (server,";
 print "\t\t\t\t_(\"glibtop_get_%s (): Client requested \"";
-print "\t\t\t\t  \"field mask %05Lx, but only have %05Lx.\"),";
-print "\t\t\t\t feature, old_required, present);";
+print "\t\t\t\t  \"field mask %05lx, but only have %05lx.\"),";
+print "\t\t\t\t feature, (unsigned long) old_required,";
+print "\t\t\t\t (unsigned long) present);";
 print "\t\tbreak;";
 print "\tcase GLIBTOP_ERROR_METHOD_ABORT:";
 print "\t\tglibtop_error_r (server,";
 print "\t\t\t\t _(\"glibtop_get_%s (): Client requested \"";
-print "\t\t\t\t   \"field mask %05x, but only have %05x.\"),";
-print "\t\t\t\t feature, old_required, present);";
+print "\t\t\t\t  \"field mask %05lx, but only have %05lx.\"),";
+print "\t\t\t\t feature, (unsigned long) old_required,";
+print "\t\t\t\t (unsigned long) present);";
 print "\t\tbreak;";
 print "\t}";
 print '}';