diff --git a/src/msw/scrolbar.cpp b/src/msw/scrolbar.cpp
index d10d08daad..4823e54f29 100644
--- a/src/msw/scrolbar.cpp
+++ b/src/msw/scrolbar.cpp
@@ -239,6 +239,7 @@ bool wxScrollBar::MSWOnScroll(int WXUNUSED(orientation), WXWORD wParam,
     }
 
     wxScrollEvent event(scrollEvent, m_windowId);
+    event.SetOrientation(IsVertical() ? wxVERTICAL : wxHORIZONTAL);
     event.SetPosition(position);
     event.SetEventObject( this );