diff --git a/test/mtproto.cpp b/test/mtproto.cpp
index ece6ba43a..568fbe36e 100644
--- a/test/mtproto.cpp
+++ b/test/mtproto.cpp
@@ -610,7 +610,7 @@ TEST(Mtproto, TlsObfusaction) {
     class Callback : public TransparentProxy::Callback {
      public:
       void set_result(Result<SocketFd> result) override {
-        CHECK(result.is_error() && result.error().message() == "response hash mismatch");
+        CHECK(result.is_error() && result.error().message() == "Response hash mismatch");
         Scheduler::instance()->finish();
       }
       void on_connected() override {