diff --git a/src/Cedar/Hub.c b/src/Cedar/Hub.c
index 32a5d04c..184f3312 100644
--- a/src/Cedar/Hub.c
+++ b/src/Cedar/Hub.c
@@ -1563,7 +1563,7 @@ void HubWatchDogThread(THREAD *t, void *param)
 		o2 = NewListFast(NULL);
 
 		// Send an ARP packet
-		LockHashList(hub->IpTable);
+		LockHashList(hub->MacHashTable);
 		{
 			num = LIST_NUM(hub->IpTable);
 			for (i = 0;i < LIST_NUM(hub->IpTable);i++)