diff --git a/qt6/mainthread/mainthread.h b/qt6/mainthread/mainthread.h
index f3124d07..dba0f1c9 100644
--- a/qt6/mainthread/mainthread.h
+++ b/qt6/mainthread/mainthread.h
@@ -1,7 +1,7 @@
 #pragma once
 
-#ifndef QT_MAINTHREAD_H
-#define QT_MAINTHREAD_H
+#ifndef MIQT_QT6_MAINTHREAD_H
+#define MIQT_QT6_MAINTHREAD_H
 
 #include <stdint.h>