diff --git a/demos/life/life.cpp b/demos/life/life.cpp
index 7f14638a7a..b6d1a7ae58 100644
--- a/demos/life/life.cpp
+++ b/demos/life/life.cpp
@@ -1057,7 +1057,7 @@ void LifeCanvas::OnScroll(wxScrollWinEvent& event)
     else
     if (type == wxEVT_SCROLLWIN_PAGEDOWN)
     {
-        scrollinc = -10;
+        scrollinc = +10;
     }
     else
     if (type == wxEVT_SCROLLWIN_THUMBTRACK)