diff --git a/test/box/net.box.result b/test/box/net.box.result
index ca976ab214a8de2260474a691b913baeaf926b05..a18546d12c1e83c7871af783f06d03fca3dae233 100644
--- a/test/box/net.box.result
+++ b/test/box/net.box.result
@@ -3855,6 +3855,10 @@ box.cfg{log_level=6}
 sock = socket.tcp_connect(LISTEN.host, LISTEN.service)
 ---
 ...
+sock:read(9)
+---
+- Tarantool
+...
 -- we need to have a packet with correctly encoded length,
 -- so that it bypasses iproto length check, but cannot be
 -- decoded in xrow_header_decode
diff --git a/test/box/net.box.test.lua b/test/box/net.box.test.lua
index fde4962831c840e75c2e4936ff7c68c1d3c77d91..07558a0dc4eac871be9e82bd3fc19e6fcc44e7b4 100644
--- a/test/box/net.box.test.lua
+++ b/test/box/net.box.test.lua
@@ -1551,6 +1551,7 @@ box.cfg{readahead = readahead}
 log_level = box.cfg.log_level
 box.cfg{log_level=6}
 sock = socket.tcp_connect(LISTEN.host, LISTEN.service)
+sock:read(9)
 -- we need to have a packet with correctly encoded length,
 -- so that it bypasses iproto length check, but cannot be
 -- decoded in xrow_header_decode