diff --git a/core/vip.c b/core/vip.c
index f2e96f8..c0e33ce 100644
--- a/core/vip.c
+++ b/core/vip.c
@@ -891,10 +891,10 @@ static void vipDrawNormal(VB *sim, World *world) {
         wnd.y1 = world->gy;
     if (wnd.y1 >= 224)
         return;
-    wnd.y2 = wnd.y1 + world->height;
+    wnd.y2 = world->gy + world->height;
     if (wnd.y2 <= 0)
         return;
-    my = wnd.y1 - world->my;
+    my = world->gy - world->my;
     if (wnd.y1 < 0)
         wnd.y1 = 0;
     if (wnd.y2 > 224)
@@ -944,10 +944,10 @@ static void vipDrawHBias(VB *sim, World *world) {
         y1 = world->gy;
     if (y1 >= 224)
         return;
-    y2 = y1 + world->height;
+    y2 = world->gy + world->height;
     if (y2 <= 0)
         return;
-    my = y1 - world->my;
+    my = world->gy - world->my;
     if (y1 < 0)
         y1 = 0;
     if (y2 > 224)