diff --git a/qucs/qucs-lib/qucslib.cpp b/qucs/qucs-lib/qucslib.cpp
index bc960a76ca..39d0cfb04f 100644
--- a/qucs/qucs-lib/qucslib.cpp
+++ b/qucs/qucs-lib/qucslib.cpp
@@ -233,6 +233,7 @@ void QucsLib::slotQuit()
     tmp = y();		// ... set them correctly before closing the ...
     tmp = width();	// dialog !!!  Otherwise the frame of the window ...
     tmp = height();	// will not be recognized (a X11 problem).
+    Q_UNUSED(tmp);
 
     qApp->quit();
 }
@@ -245,6 +246,7 @@ void QucsLib::closeEvent(QCloseEvent *Event)
     tmp = y();		// ... set them correctly before closing the ...
     tmp = width();	// dialog !!!  Otherwise the frame of the window ...
     tmp = height();	// will not be recognized (a X11 problem).
+    Q_UNUSED(tmp);
 
     Event->accept();
 }