diff --git a/mysql-test/lib/v1/mtr_cases.pl b/mysql-test/lib/v1/mtr_cases.pl
index 3b47a89d3d2..4d7b1f4ec70 100644
--- a/mysql-test/lib/v1/mtr_cases.pl
+++ b/mysql-test/lib/v1/mtr_cases.pl
@@ -369,7 +369,7 @@ sub collect_one_suite($)
 	my $comb= {};
 	$comb->{name}= $group->name();
         foreach my $option ( $group->options() ) {
-	  push(@{$comb->{comb_opt}}, $option->name()."=".$option->value());
+	  push(@{$comb->{comb_opt}}, "--".$option->name()."=".$option->value());
 	}
 	push(@combinations, $comb);
       }