diff --git a/regress/projects/black_box/regress/test_miss_send_length/run.pl b/regress/projects/black_box/regress/test_miss_send_length/run.pl
index 454fe9e..2b9cb51 100755
--- a/regress/projects/black_box/regress/test_miss_send_length/run.pl
+++ b/regress/projects/black_box/regress/test_miss_send_length/run.pl
@@ -11,6 +11,9 @@ sub verify_packet_in {
     my $in_port = $$options_ref{'port_base'};
     my $out_port = $in_port + 1;
 
+    # Give OF switch time to process the set_config
+    usleep($$options_ref{'send_delay'});
+
     my $pkt = get_default_black_box_pkt_len($in_port, $out_port, $pktsiz);
     nftest_send('eth1', $pkt->packed);
 
diff --git a/regress/projects/black_box/regress/test_switch_config/run.pl b/regress/projects/black_box/regress/test_switch_config/run.pl
index dc36d41..cbb4886 100755
--- a/regress/projects/black_box/regress/test_switch_config/run.pl
+++ b/regress/projects/black_box/regress/test_switch_config/run.pl
@@ -27,6 +27,9 @@ sub my_test {
 	
 	set_config($ofp, $sock, $options_ref, $flags, $miss_send_len);
 	
+	# Give OF switch time to process the set_config
+	usleep($$options_ref{'send_delay'});
+
 	$msg = get_config( $ofp, $sock );
 	
 	compare( "miss send len", $$msg{'miss_send_len'}, '==', $miss_send_len );