diff --git a/src/viewport.cpp b/src/viewport.cpp
index 6a05d617af..8aa9995faa 100644
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -2617,14 +2617,30 @@ void ViewportDoDraw(const ViewPort *vp, int left, int top, int right, int bottom
 	_vd.child_screen_sprites_to_draw.Clear();
 }
 
+/**
+ * Make sure we don't draw a too big area at a time.
+ * If we do, the sprite memory will overflow.
+ */
 static void ViewportDrawChk(const ViewPort *vp, int left, int top, int right, int bottom)
 {
-	ViewportDoDraw(vp,
-		ScaleByZoom(left - vp->left, vp->zoom) + vp->virtual_left,
-		ScaleByZoom(top - vp->top, vp->zoom) + vp->virtual_top,
-		ScaleByZoom(right - vp->left, vp->zoom) + vp->virtual_left,
-		ScaleByZoom(bottom - vp->top, vp->zoom) + vp->virtual_top
-	);
+	if ((vp->zoom < ZOOM_LVL_DRAW_MAP) && (ScaleByZoom(bottom - top, vp->zoom) * ScaleByZoom(right - left, vp->zoom) > 180000 * ZOOM_LVL_BASE * ZOOM_LVL_BASE)) {
+		if ((bottom - top) > (right - left)) {
+			int t = (top + bottom) >> 1;
+			ViewportDrawChk(vp, left, top, right, t);
+			ViewportDrawChk(vp, left, t, right, bottom);
+		} else {
+			int t = (left + right) >> 1;
+			ViewportDrawChk(vp, left, top, t, bottom);
+			ViewportDrawChk(vp, t, top, right, bottom);
+		}
+	} else {
+		ViewportDoDraw(vp,
+			ScaleByZoom(left - vp->left, vp->zoom) + vp->virtual_left,
+			ScaleByZoom(top - vp->top, vp->zoom) + vp->virtual_top,
+			ScaleByZoom(right - vp->left, vp->zoom) + vp->virtual_left,
+			ScaleByZoom(bottom - vp->top, vp->zoom) + vp->virtual_top
+		);
+	}
 }
 
 static inline void ViewportDraw(const ViewPort *vp, int left, int top, int right, int bottom)