diff --git a/td/mtproto/SessionConnection.cpp b/td/mtproto/SessionConnection.cpp
index 7fb7ed295..579257917 100644
--- a/td/mtproto/SessionConnection.cpp
+++ b/td/mtproto/SessionConnection.cpp
@@ -743,7 +743,7 @@ void SessionConnection::send_crypto(const Storer &storer, uint64 quick_ack_token
 
 Result<uint64> SessionConnection::send_query(BufferSlice buffer, bool gzip_flag, int64 message_id,
                                              uint64 invoke_after_id, bool use_quick_ack) {
-  LOG_CHECK(mode_ != Mode::HttpLongPoll) << "LongPoll connection is only for http_wait";
+  CHECK(mode_ != Mode::HttpLongPoll);  // "LongPoll connection is only for http_wait"
   if (message_id == 0) {
     message_id = auth_data_->next_message_id(Time::now_cached());
   }
diff --git a/test/secret.cpp b/test/secret.cpp
index 9349a24c4..8b3505922 100644
--- a/test/secret.cpp
+++ b/test/secret.cpp
@@ -204,7 +204,7 @@ static void downcast_call(TlBufferParser &p, F &&f) {
     case messages_sendEncryptedService::ID:
       return f(*make_tl_object<messages_sendEncryptedService>(p));
     default:
-      LOG_CHECK(0) << id;
+      LOG(ERROR) << "Unknown constructor " << id;
       UNREACHABLE();
   }
 }
diff --git a/test/tdclient.cpp b/test/tdclient.cpp
index b4f850c18..7a91113c3 100644
--- a/test/tdclient.cpp
+++ b/test/tdclient.cpp
@@ -236,7 +236,8 @@ class DoAuthentication : public Task {
         on_authorization_ready();
         return;
       default:
-        LOG_CHECK(false) << "Unexpected authorization state " << to_string(authorization_state);
+        LOG(ERROR) << "Unexpected authorization state " << to_string(authorization_state);
+        UNREACHABLE();
     }
     send_query(std::move(function), [](auto res) { LOG_CHECK(res->get_id() == td_api::ok::ID) << to_string(res); });
   }