diff --git a/GUI/host/textthread.cc b/GUI/host/textthread.cc
index 8ee7192..b53d7f9 100644
--- a/GUI/host/textthread.cc
+++ b/GUI/host/textthread.cc
@@ -26,7 +26,7 @@ void TextThread::Flush()
 	std::wstring sentence;
 	{
 		LOCK(ttMutex);
-		if (buffer.size() < 400 && (timestamp - GetTickCount() < 250 || buffer.size() == 0)) return; // TODO: let user change delay before sentence is flushed
+		if (buffer.size() < 400 && (GetTickCount() - timestamp < 250 || buffer.size() == 0)) return; // TODO: let user change delay before sentence is flushed
 		if (status & USING_UNICODE)
 		{
 			sentence = std::wstring((wchar_t*)buffer.data(), buffer.size() / 2);