diff --git a/netbench.pl b/netbench.pl
index 0b505a9..de81ee4 100755
--- a/netbench.pl
+++ b/netbench.pl
@@ -210,6 +210,7 @@ sub start_server_udp {
     my ($proc) = @_;
 
     my $timeout = 1;
+    $timeout += $opts{d} if defined($opts{d});
     $timeout += $opts{i} if defined($opts{i});
     $timeout += $opts{t} if defined($opts{t});
     my @cmd = ('udpbench');