diff --git a/sys/net/route/nhgrp_ctl.c b/sys/net/route/nhgrp_ctl.c
index 6a3f853e073d..fc9e67c21fe9 100644
--- a/sys/net/route/nhgrp_ctl.c
+++ b/sys/net/route/nhgrp_ctl.c
@@ -295,7 +295,7 @@ void
 nhgrp_ref_object(struct nhgrp_object *nhg)
 {
 	struct nhgrp_priv *nhg_priv;
-	u_int old;
+	u_int old __diagused;
 
 	nhg_priv = NHGRP_PRIV(nhg);
 	old = refcount_acquire(&nhg_priv->nhg_refcount);
diff --git a/sys/net/route/nhop_ctl.c b/sys/net/route/nhop_ctl.c
index 6a82391307f1..785244e5e964 100644
--- a/sys/net/route/nhop_ctl.c
+++ b/sys/net/route/nhop_ctl.c
@@ -631,7 +631,7 @@ destroy_nhop_epoch(epoch_context_t ctx)
 void
 nhop_ref_object(struct nhop_object *nh)
 {
-	u_int old;
+	u_int old __diagused;
 
 	old = refcount_acquire(&nh->nh_priv->nh_refcnt);
 	KASSERT(old > 0, ("%s: nhop object %p has 0 refs", __func__, nh));