diff --git a/src/interface/pxe/pxe.c b/src/interface/pxe/pxe.c
index 80b411db..8aa7df0d 100644
--- a/src/interface/pxe/pxe.c
+++ b/src/interface/pxe/pxe.c
@@ -25,6 +25,7 @@
 #include "dev.h"
 #include "pxe.h"
 
+#warning "pxe_netdev should hold a persistent reference to the net device"
 struct net_device *pxe_netdev = NULL;
 
 #if 0