diff --git a/DSView/pv/view/viewport.cpp b/DSView/pv/view/viewport.cpp
index 5f52b6de..3caa6b22 100644
--- a/DSView/pv/view/viewport.cpp
+++ b/DSView/pv/view/viewport.cpp
@@ -1092,7 +1092,7 @@ void Viewport::wheelEvent(QWheelEvent *event)
             static int64_t last_time;
             if (event->source() == Qt::MouseEventSynthesizedBySystem)
             {
-                if (active && (event->modifiers() & Qt::ShiftModifier))
+                if (active)
                 {
                     last_time = QDateTime::currentMSecsSinceEpoch();
                     const double scale = delta > 1.5 ? 1 : (delta < -1.5 ? -1 : 0);