diff --git a/tools/diag/ac/cknames.pl b/tools/diag/ac/cknames.pl
index 82c3d8b8978b..4363f65a174b 100644
--- a/tools/diag/ac/cknames.pl
+++ b/tools/diag/ac/cknames.pl
@@ -57,6 +57,7 @@ while (<ACCESS>) {
 	chomp;
 	next if /^#/;
 	($accuser, undef) = split /\s/;
+	$accuser =~ s/_//g;
 	print "access user: $accuser\n" if $debug;
 	$access{$accuser} = 1;
 }