diff --git a/src/vnet/udp/udp_input.c b/src/vnet/udp/udp_input.c
index e6b4f8f..9a8ff07 100644
--- a/src/vnet/udp/udp_input.c
+++ b/src/vnet/udp/udp_input.c
@@ -123,7 +123,7 @@
 	  /* lookup session */
 	  s0 = stream_session_lookup4 (&ip0->dst_address, &ip0->src_address,
 				       udp0->dst_port, udp0->src_port,
-				       SESSION_TYPE_IP4_UDP, my_thread_index);
+				       SESSION_TYPE_IP4_UDP);
 
 	  /* no listener */
 	  if (PREDICT_FALSE (s0 == 0))