diff --git a/contrib/embeddable-wg-library/wireguard.c b/contrib/embeddable-wg-library/wireguard.c
index a713567..16ddd9a 100644
--- a/contrib/embeddable-wg-library/wireguard.c
+++ b/contrib/embeddable-wg-library/wireguard.c
@@ -358,11 +358,15 @@ static void mnl_attr_put(struct nlmsghdr *nlh, uint16_t type, size_t len,
 {
 	struct nlattr *attr = mnl_nlmsg_get_payload_tail(nlh);
 	uint16_t payload_len = MNL_ALIGN(sizeof(struct nlattr)) + len;
+	int pad;
 
 	attr->nla_type = type;
 	attr->nla_len = payload_len;
 	memcpy(mnl_attr_get_payload(attr), data, len);
 	nlh->nlmsg_len += MNL_ALIGN(payload_len);
+	pad = MNL_ALIGN(len) - len;
+	if (pad > 0)
+		memset(mnl_attr_get_payload(attr) + len, 0, pad);
 }
 
 static void mnl_attr_put_u16(struct nlmsghdr *nlh, uint16_t type, uint16_t data)