diff --git a/sys/dev/cxgbe/tom/t4_tom.c b/sys/dev/cxgbe/tom/t4_tom.c
index 7c01b424b2ec..705a2175f932 100644
--- a/sys/dev/cxgbe/tom/t4_tom.c
+++ b/sys/dev/cxgbe/tom/t4_tom.c
@@ -382,6 +382,7 @@ t4_pcb_detach(struct toedev *tod __unused, struct tcpcb *tp)
 	}
 #endif
 
+	tp->tod = NULL;
 	tp->t_toe = NULL;
 	tp->t_flags &= ~TF_TOE;
 	toep->flags &= ~TPF_ATTACHED;