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-rw-r--r--src/viewport.cpp8
1 files changed, 4 insertions, 4 deletions
diff --git a/src/viewport.cpp b/src/viewport.cpp
index a6cacd24b..0622f85a3 100644
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -1649,10 +1649,10 @@ static void MarkViewportDirty(const ViewPort *vp, int left, int top, int right,
if (top >= vp->virtual_height) return;
SetDirtyBlocks(
- UnScaleByZoom(left, vp->zoom) + vp->left,
- UnScaleByZoom(top, vp->zoom) + vp->top,
- UnScaleByZoom(right, vp->zoom) + vp->left,
- UnScaleByZoom(bottom, vp->zoom) + vp->top
+ UnScaleByZoomLower(left, vp->zoom) + vp->left,
+ UnScaleByZoomLower(top, vp->zoom) + vp->top,
+ UnScaleByZoom(right, vp->zoom) + vp->left + 1,
+ UnScaleByZoom(bottom, vp->zoom) + vp->top + 1
);
}