diff --git a/qad/blockview/blockview.cpp b/qad/blockview/blockview.cpp
index ea3e3f1..006ac40 100644
--- a/qad/blockview/blockview.cpp
+++ b/qad/blockview/blockview.cpp
@@ -59,6 +59,7 @@ void BlockView::_init() {
 	mm_drag = moved = new_branch = new_bus = mm_cancel = iconnect = mm_copy = m_pin_mc = mm_thumb = false;
 	match_bus = bus_from = 0;
 	mm_ci = 0;
+	timer_thumb = 0;
 	hpin = 0;
 	grid_step = 10.;
 	grid_points = 1;