diff --git a/sys/dev/vnic/nicvf_main.c b/sys/dev/vnic/nicvf_main.c
index 1dc49ee855a9..0794c7d53113 100644
--- a/sys/dev/vnic/nicvf_main.c
+++ b/sys/dev/vnic/nicvf_main.c
@@ -1251,7 +1251,7 @@ nicvf_release_all_interrupts(struct nicvf *nic)
 {
 	struct resource *res;
 	int irq;
-	int err;
+	int err __diagused;
 
 	/* Free registered interrupts */
 	for (irq = 0; irq < nic->num_vec; irq++) {
diff --git a/sys/dev/vnic/nicvf_queues.c b/sys/dev/vnic/nicvf_queues.c
index bb3eacb75fad..6cb939fdcc25 100644
--- a/sys/dev/vnic/nicvf_queues.c
+++ b/sys/dev/vnic/nicvf_queues.c
@@ -161,7 +161,7 @@ static int
 nicvf_alloc_q_desc_mem(struct nicvf *nic, struct q_desc_mem *dmem,
     int q_len, int desc_size, int align_bytes)
 {
-	int err, err_dmat;
+	int err, err_dmat __diagused;
 
 	/* Create DMA tag first */
 	err = bus_dma_tag_create(
@@ -231,7 +231,7 @@ dmamem_fail:
 static void
 nicvf_free_q_desc_mem(struct nicvf *nic, struct q_desc_mem *dmem)
 {
-	int err;
+	int err __diagused;
 
 	if ((dmem == NULL) || (dmem->base == NULL))
 		return;
@@ -438,7 +438,7 @@ nicvf_free_rbdr(struct nicvf *nic, struct rbdr *rbdr)
 	struct rbuf_info *rinfo;
 	bus_addr_t buf_addr;
 	int head, tail, idx;
-	int err;
+	int err __diagused;
 
 	qs = nic->qs;
 
@@ -1142,7 +1142,7 @@ nicvf_free_snd_queue(struct nicvf *nic, struct snd_queue *sq)
 {
 	struct queue_set *qs = nic->qs;
 	size_t i;
-	int err;
+	int err __diagused;
 
 	if (sq == NULL)
 		return;