diff --git a/src/lib/ndpi_main.c b/src/lib/ndpi_main.c
index 22a57e1cbcd..394caf66fba 100644
--- a/src/lib/ndpi_main.c
+++ b/src/lib/ndpi_main.c
@@ -2129,7 +2129,7 @@ static void ndpi_init_protocol_defaults(struct ndpi_detection_module_struct *ndp
   ndpi_set_proto_defaults(ndpi_str, 1 /* cleartext */, 0 /* nw proto */, NDPI_PROTOCOL_ACCEPTABLE, NDPI_PROTOCOL_PTPV2,
 			  "PTPv2", NDPI_PROTOCOL_CATEGORY_SYSTEM_OS,
 			  ndpi_build_default_ports(ports_a, 0, 0, 0, 0, 0) /* TCP */,
-			  ndpi_build_default_ports(ports_b, 0, 0, 0, 0, 0) /* UDP */);
+			  ndpi_build_default_ports(ports_b, 319, 320, 0, 0, 0) /* UDP */);
 
 #ifdef CUSTOM_NDPI_PROTOCOLS
 #include "../../../nDPI-custom/custom_ndpi_main.c"