diff --git a/mailboxes/mailboxes-lib.pl b/mailboxes/mailboxes-lib.pl
index 39d27e4eb..8e812b447 100755
--- a/mailboxes/mailboxes-lib.pl
+++ b/mailboxes/mailboxes-lib.pl
@@ -1222,7 +1222,7 @@ foreach my $mail (@mail) {
 
 	# Date and size columns
 	push(@cols, &eucconv_and_escape(&simplify_date($mail->{'header'}->{'date'}, "ymd")));
-	push(@cols, &nice_size($mail->{'size'}));
+	push(@cols, &nice_size($mail->{'size'}, 1024));
 	$rowtds[$#cols] .= " data-sort=".$mail->{'size'};
 
 	# Subject with icons