diff --git a/src/viewport.cpp b/src/viewport.cpp
index 6ab7cf8df2..c4d6ea0a63 100644
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -3100,7 +3100,7 @@ void ViewportDoDraw(const ViewPort *vp, int left, int top, int right, int bottom
  */
 static void ViewportDrawChk(const ViewPort *vp, int left, int top, int right, int bottom)
 {
-	if ((vp->zoom < ZOOM_LVL_DRAW_MAP) && ((int64)ScaleByZoom(bottom - top, vp->zoom) * (int64)ScaleByZoom(right - left, vp->zoom) > (int64)(180000 * ZOOM_LVL_BASE * ZOOM_LVL_BASE))) {
+	if ((vp->zoom < ZOOM_LVL_DRAW_MAP) && ((int64)ScaleByZoom(bottom - top, vp->zoom) * (int64)ScaleByZoom(right - left, vp->zoom) > (int64)(1000000 * ZOOM_LVL_BASE * ZOOM_LVL_BASE))) {
 		if ((bottom - top) > (right - left)) {
 			int t = (top + bottom) >> 1;
 			ViewportDrawChk(vp, left, top, right, t);