diff --git a/source/gui/widgets/listbox.cpp b/source/gui/widgets/listbox.cpp
index 707eb339..3ff96ced 100644
--- a/source/gui/widgets/listbox.cpp
+++ b/source/gui/widgets/listbox.cpp
@@ -2289,9 +2289,9 @@ namespace nana
 
 					index_pair target;
 					if(upwards == false)
-						lister.forward(scroll.offset_y_dpl, 1, target);
+						lister.forward(scroll.offset_y_dpl, 3, target);  // scheme ??
 					else
-						lister.backward(scroll.offset_y_dpl, 1, target);
+						lister.backward(scroll.offset_y_dpl, 3, target);
 
 					if (target == scroll.offset_y_dpl)
 						return false;