diff --git a/src/qt/qt_rendererstack.cpp b/src/qt/qt_rendererstack.cpp
index 431b3609b..79fa78097 100644
--- a/src/qt/qt_rendererstack.cpp
+++ b/src/qt/qt_rendererstack.cpp
@@ -77,7 +77,7 @@ RendererStack::RendererStack(QWidget *parent, int monitor_index)
 
     m_monitor_index = monitor_index;
 #if defined __unix__ && !defined __HAIKU__
-    char auto_mouse_type[16];
+    memset(auto_mouse_type, 0, sizeof (auto_mouse_type));
     mousedata.mouse_type = getenv("EMU86BOX_MOUSE");
     if (!mousedata.mouse_type || (mousedata.mouse_type[0] == '\0') || !stricmp(mousedata.mouse_type, "auto")) {
         if (QApplication::platformName().contains("wayland"))
diff --git a/src/qt/qt_rendererstack.hpp b/src/qt/qt_rendererstack.hpp
index 172dc2fe6..3a76f3ada 100644
--- a/src/qt/qt_rendererstack.hpp
+++ b/src/qt/qt_rendererstack.hpp
@@ -137,6 +137,8 @@ private:
 
     std::atomic_bool rendererTakesScreenshots;
     std::atomic_bool switchInProgress{false};
+
+    char auto_mouse_type[16];
 };
 
 #endif // QT_RENDERERCONTAINER_HPP