--- a/media/mtransport/test_nr_socket.cpp
+++ b/media/mtransport/test_nr_socket.cpp
@@ -480,27 +480,33 @@ int TestNrSocket::write(const void *msg,
     }
     // This is TCP only
     MOZ_ASSERT(port_mappings_.size() == 1);
     r_log(LOG_GENERIC, LOG_INFO,
           "PortMapping %s -> %s writing",
           port_mappings_.front()->external_socket_->my_addr().as_string,
           port_mappings_.front()->remote_address_.as_string);
 
+    port_mappings_.front()->last_used_ = PR_IntervalNow();
     return port_mappings_.front()->external_socket_->write(msg, len, written);
   }
 }
 
 int TestNrSocket::read(void *buf, size_t maxlen, size_t *len) {
 
   if (port_mappings_.empty()) {
     return internal_socket_->read(buf, maxlen, len);
   } else {
     MOZ_ASSERT(port_mappings_.size() == 1);
-    return port_mappings_.front()->external_socket_->read(buf, maxlen, len);
+    int bytesRead =
+      port_mappings_.front()->external_socket_->read(buf, maxlen, len);
+    if (bytesRead > 0 && nat_->refresh_on_ingress_) {
+      port_mappings_.front()->last_used_ = PR_IntervalNow();
+    }
+    return bytesRead;
   }
 }
 
 int TestNrSocket::async_wait(int how, NR_async_cb cb, void *cb_arg,
                              char *function, int line) {
   r_log(LOG_GENERIC, LOG_DEBUG, "TestNrSocket %s waiting for %s",
                                 internal_socket_->my_addr().as_string,
                                 how == NR_ASYNC_WAIT_READ ? "read" : "write");