diff --git a/module/sock/posix/posix.c b/module/sock/posix/posix.c
index e0ce2b084..d7632002e 100644
--- a/module/sock/posix/posix.c
+++ b/module/sock/posix/posix.c
@@ -808,7 +808,13 @@ _sock_flush(struct spdk_sock *sock)
 		return rc;
 	}
 
-	psock->sendmsg_idx++;
+	/* Handling overflow case, because we use psock->sendmsg_idx - 1 for the
+	 * req->internal.offset, so sendmsg_idx should not be zero  */
+	if (spdk_unlikely(psock->sendmsg_idx == UINT32_MAX)) {
+		psock->sendmsg_idx = 1;
+	} else {
+		psock->sendmsg_idx++;
+	}
 
 	/* Consume the requests that were actually written */
 	req = TAILQ_FIRST(&sock->queued_reqs);