diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
index 9f70b4332238..38441be68592 100644
--- a/include/net/mana/mana.h
+++ b/include/net/mana/mana.h
@@ -338,7 +338,7 @@ struct mana_rxq {
 	/* MUST BE THE LAST MEMBER:
 	 * Each receive buffer has an associated mana_recv_buf_oob.
 	 */
-	struct mana_recv_buf_oob rx_oobs[];
+	struct mana_recv_buf_oob rx_oobs[] __counted_by(num_rx_buf);
 };
 
 struct mana_tx_qp {