diff --git a/src/bacnet/datalink/dlenv.c b/src/bacnet/datalink/dlenv.c
index df3116d0..3def0386 100644
--- a/src/bacnet/datalink/dlenv.c
+++ b/src/bacnet/datalink/dlenv.c
@@ -918,6 +918,8 @@ void dlenv_init(void)
         tsm_invokeID_set((uint8_t)strtol(pEnv, NULL, 0));
     }
 #endif
+#if (BACNET_PROTOCOL_REVISION >= 17)
     dlenv_network_port_init();
+#endif
     dlenv_register_as_foreign_device();
 }