diff --git a/src/Mod/TechDraw/Gui/QGIViewDimension.cpp b/src/Mod/TechDraw/Gui/QGIViewDimension.cpp
index 4858fbc4c8..4724fa732a 100644
--- a/src/Mod/TechDraw/Gui/QGIViewDimension.cpp
+++ b/src/Mod/TechDraw/Gui/QGIViewDimension.cpp
@@ -144,6 +144,7 @@ void QGIDatumLabel::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
 {
     QGIView *view = dynamic_cast<QGIView *> (parentItem());
     assert(view != 0);
+    Q_UNUSED(view);
 
     Q_EMIT hover(false);
     if (!isSelected()) {