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-rw-r--r--src/viewport.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/viewport.cpp b/src/viewport.cpp
index 46d9d77c9..5d9b395e9 100644
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -1293,7 +1293,7 @@ void ViewportDoDraw(const ViewPort *vp, int left, int top, int right, int bottom
// If we do, the sprite memory will overflow.
static void ViewportDrawChk(const ViewPort *vp, int left, int top, int right, int bottom)
{
- if (((bottom - top) * (right - left) << vp->zoom) > 180000) {
+ if (((bottom - top) * (right - left) << (2 * vp->zoom)) > 180000) {
if ((bottom - top) > (right - left)) {
int t = (top + bottom) >> 1;
ViewportDrawChk(vp, left, top, right, t);