diff --git a/drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2_format.h b/drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2_format.h
index b001e52580911..47f6cc0401c39 100644
--- a/drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2_format.h
+++ b/drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2_format.h
@@ -44,7 +44,7 @@ MLXFW_MFA2_TLV(multi, struct mlxfw_mfa2_tlv_multi,
 	       MLXFW_MFA2_TLV_MULTI_PART);
 
 struct mlxfw_mfa2_tlv_psid {
-	u8 psid[0];
+	DECLARE_FLEX_ARRAY(u8, psid);
 } __packed;
 
 MLXFW_MFA2_TLV_VARSIZE(psid, struct mlxfw_mfa2_tlv_psid,