diff --git a/src/slic3r/GUI/Widgets/DropDown.cpp b/src/slic3r/GUI/Widgets/DropDown.cpp
index 8095969ed..a7ed6be9f 100644
--- a/src/slic3r/GUI/Widgets/DropDown.cpp
+++ b/src/slic3r/GUI/Widgets/DropDown.cpp
@@ -422,7 +422,7 @@ void DropDown::mouseMove(wxMouseEvent &event)
 
 void DropDown::mouseWheelMoved(wxMouseEvent &event)
 {
-    auto delta = (event.GetWheelRotation() < 0 == event.IsWheelInverted()) ? rowSize.y : -rowSize.y;
+    auto delta = event.GetWheelRotation() > 0 ? rowSize.y : -rowSize.y;
     wxPoint pt2 = offset + wxPoint{0, delta};
     if (pt2.y > 0)
         pt2.y = 0;