diff --git a/dma.c b/dma.c
index b87b4653..6ea58aec 100644
--- a/dma.c
+++ b/dma.c
@@ -318,7 +318,7 @@ static int
 mt76_dma_tx_queue_skb_raw(struct mt76_dev *dev, struct mt76_queue *q,
 			  struct sk_buff *skb, u32 tx_info)
 {
-	struct mt76_queue_buf buf;
+	struct mt76_queue_buf buf = {};
 	dma_addr_t addr;
 
 	if (q->queued + 1 >= q->ndesc - 1)