diff --git a/examples/nvme/perf/perf.c b/examples/nvme/perf/perf.c
index 5ca7709fd..f5ce6493d 100644
--- a/examples/nvme/perf/perf.c
+++ b/examples/nvme/perf/perf.c
@@ -1412,8 +1412,8 @@ static void usage(char *program_name)
 	printf("\t");
 	spdk_log_usage(stdout, "-T");
 	printf("\t[-V enable VMD enumeration]\n");
-	printf("\t[-z disable zero copy send for the given sock implementation]\n");
-	printf("\t[-Z enable zero copy send for the given sock implementation. Default for posix impl]\n");
+	printf("\t[-z disable zero copy send for the given sock implementation. Default for posix impl]\n");
+	printf("\t[-Z enable zero copy send for the given sock implementation]\n");
 	printf("\t[-A IO buffer alignment. Must be power of 2 and not less than cache line (%u)]\n",
 	       SPDK_CACHE_LINE_SIZE);
 	printf("\t[-S set the default sock impl, e.g. \"posix\"]\n");
diff --git a/module/sock/posix/posix.c b/module/sock/posix/posix.c
index 534a61b54..aafdb0f1c 100644
--- a/module/sock/posix/posix.c
+++ b/module/sock/posix/posix.c
@@ -81,7 +81,7 @@ static struct spdk_sock_impl_opts g_spdk_posix_sock_impl_opts = {
 	.recv_buf_size = MIN_SO_RCVBUF_SIZE,
 	.send_buf_size = MIN_SO_SNDBUF_SIZE,
 	.enable_recv_pipe = true,
-	.enable_zerocopy_send = true,
+	.enable_zerocopy_send = false,
 	.enable_quickack = false,
 	.enable_placement_id = false,
 };