diff --git a/qad/blockview/blockview.cpp b/qad/blockview/blockview.cpp
index 07ef3c3..f860bec 100644
--- a/qad/blockview/blockview.cpp
+++ b/qad/blockview/blockview.cpp
@@ -258,7 +258,7 @@ bool BlockView::eventFilter(QObject * o, QEvent * e) {
 			mm_drag = moved = false;
 			screen_point = me->screenPos();
 			scene_point = me->scenePos();
-			if ((me->button() == Qt::MidButton) || (me->button() == Qt::RightButton)) {
+			if ((me->button() == Qt::MidButton)) {
 				thumbShow();
 				restartTimer(timer_thumb, thumb_hide_delay);
 				return true;