diff --git a/openair3/ocp-gtpu/gtp_itf.cpp b/openair3/ocp-gtpu/gtp_itf.cpp
index 2c702fa36a..10418c996a 100644
--- a/openair3/ocp-gtpu/gtp_itf.cpp
+++ b/openair3/ocp-gtpu/gtp_itf.cpp
@@ -19,7 +19,7 @@ extern "C" {
 #include <openair2/LAYER2/PDCP_v10.1.0/pdcp.h>
 #include <openair2/LAYER2/nr_rlc/nr_rlc_oai_api.h>
 #include "openair2/SDAP/nr_sdap/nr_sdap.h"
-//#include <openair1/PHY/phy_extern.h>
+#include "sim.h"
 
 #pragma pack(1)
 
@@ -143,6 +143,10 @@ class gtpEndPoints {
   // the instance id will be the Linux socket handler, as this is uniq
   map<uint64_t, gtpEndPoint> instances;
 
+  gtpEndPoints() {
+    srandom(get_random_seed());
+  }
+
   ~gtpEndPoints() {
     // automatically close all sockets on quit
     for (const auto &p : instances)