diff --git a/module/sock/posix/posix.c b/module/sock/posix/posix.c
index 15dff0541..3ec1061c5 100644
--- a/module/sock/posix/posix.c
+++ b/module/sock/posix/posix.c
@@ -438,6 +438,8 @@ static int
 _sock_flush(struct spdk_sock *sock)
 {
 	struct spdk_posix_sock *psock = __posix_sock(sock);
+	struct msghdr msg = {};
+	int flags;
 	struct iovec iovs[IOV_BATCH_SIZE];
 	int iovcnt;
 	int retval;
@@ -488,7 +490,10 @@ _sock_flush(struct spdk_sock *sock)
 	}
 
 	/* Perform the vectored write */
-	rc = writev(psock->fd, iovs, iovcnt);
+	msg.msg_iov = iovs;
+	msg.msg_iovlen = iovcnt;
+	flags = 0;
+	rc = sendmsg(psock->fd, &msg, flags);
 	if (rc <= 0) {
 		if (errno == EAGAIN || errno == EWOULDBLOCK) {
 			return 0;
@@ -526,7 +531,7 @@ _sock_flush(struct spdk_sock *sock)
 		req->internal.offset = 0;
 		spdk_sock_request_pend(sock, req);
 
-		/* The writev syscall above isn't currently asynchronous,
+		/* The sendmsg syscall above isn't currently asynchronous,
 		 * so it's already done. */
 		retval = spdk_sock_request_put(sock, req, 0);
 
diff --git a/test/unit/lib/sock/posix.c/posix_ut.c b/test/unit/lib/sock/posix.c/posix_ut.c
index ae61d7cfd..b8a704043 100644
--- a/test/unit/lib/sock/posix.c/posix_ut.c
+++ b/test/unit/lib/sock/posix.c/posix_ut.c
@@ -86,9 +86,9 @@ flush(void)
 	req2->cb_arg = &cb_arg2;
 
 	/* Simple test - a request with a 2 element iovec
-	 * that gets submitted in a single writev. */
+	 * that gets submitted in a single sendmsg. */
 	spdk_sock_request_queue(sock, req1);
-	MOCK_SET(writev, 64);
+	MOCK_SET(sendmsg, 64);
 	cb_arg1 = false;
 	rc = _sock_flush(sock);
 	CU_ASSERT(rc == 0);
@@ -98,7 +98,7 @@ flush(void)
 	/* Two requests, where both can fully send. */
 	spdk_sock_request_queue(sock, req1);
 	spdk_sock_request_queue(sock, req2);
-	MOCK_SET(writev, 128);
+	MOCK_SET(sendmsg, 128);
 	cb_arg1 = false;
 	cb_arg2 = false;
 	rc = _sock_flush(sock);
@@ -110,7 +110,7 @@ flush(void)
 	/* Two requests. Only first one can send */
 	spdk_sock_request_queue(sock, req1);
 	spdk_sock_request_queue(sock, req2);
-	MOCK_SET(writev, 64);
+	MOCK_SET(sendmsg, 64);
 	cb_arg1 = false;
 	cb_arg2 = false;
 	rc = _sock_flush(sock);
@@ -123,7 +123,7 @@ flush(void)
 
 	/* One request. Partial send. */
 	spdk_sock_request_queue(sock, req1);
-	MOCK_SET(writev, 10);
+	MOCK_SET(sendmsg, 10);
 	cb_arg1 = false;
 	rc = _sock_flush(sock);
 	CU_ASSERT(rc == 0);
@@ -131,7 +131,7 @@ flush(void)
 	CU_ASSERT(TAILQ_FIRST(&sock->queued_reqs) == req1);
 
 	/* Do a second flush that partial sends again. */
-	MOCK_SET(writev, 24);
+	MOCK_SET(sendmsg, 24);
 	cb_arg1 = false;
 	rc = _sock_flush(sock);
 	CU_ASSERT(rc == 0);
@@ -139,7 +139,7 @@ flush(void)
 	CU_ASSERT(TAILQ_FIRST(&sock->queued_reqs) == req1);
 
 	/* Flush the rest of the data */
-	MOCK_SET(writev, 30);
+	MOCK_SET(sendmsg, 30);
 	cb_arg1 = false;
 	rc = _sock_flush(sock);
 	CU_ASSERT(rc == 0);