diff --git a/DSView/pv/view/viewport.cpp b/DSView/pv/view/viewport.cpp
index c6e416c0..5f52b6de 100755
--- a/DSView/pv/view/viewport.cpp
+++ b/DSView/pv/view/viewport.cpp
@@ -785,7 +785,7 @@ void Viewport::mouseReleaseEvent(QMouseEvent *event)
                     if (isMaxWindow && mvk > 0.4f){
                         quickScroll = true;
                     }
-                    else if (!isMaxWindow && mvk > 0.5f){
+                    else if (!isMaxWindow && mvk > 0.25f){
                         quickScroll = true;
                     }
                 }