diff --git a/lib/sock/posix/posix.c b/lib/sock/posix/posix.c
index fc341f06a..565d38926 100644
--- a/lib/sock/posix/posix.c
+++ b/lib/sock/posix/posix.c
@@ -319,6 +319,7 @@ spdk_posix_sock_accept(struct spdk_sock *_sock)
 	socklen_t			salen;
 	int				rc;
 	struct spdk_posix_sock		*new_sock;
+	int				flag;
 
 	memset(&sa, 0, sizeof(sa));
 	salen = sizeof(sa);
@@ -331,6 +332,13 @@ spdk_posix_sock_accept(struct spdk_sock *_sock)
 		return NULL;
 	}
 
+	flag = fcntl(rc, F_GETFL);
+	if ((!(flag & O_NONBLOCK)) && (fcntl(rc, F_SETFL, flag | O_NONBLOCK) < 0)) {
+		SPDK_ERRLOG("fcntl can't set nonblocking mode for socket, fd: %d (%d)\n", rc, errno);
+		close(rc);
+		return NULL;
+	}
+
 	new_sock = calloc(1, sizeof(*sock));
 	if (new_sock == NULL) {
 		SPDK_ERRLOG("sock allocation failed\n");