diff --git a/src/lib/sw_engine/tvgSwRle.cpp b/src/lib/sw_engine/tvgSwRle.cpp
index b22b2331..1d5577bf 100644
--- a/src/lib/sw_engine/tvgSwRle.cpp
+++ b/src/lib/sw_engine/tvgSwRle.cpp
@@ -672,6 +672,7 @@ SwRleData* rleRender(const SwOutline* outline, const SwBBox& bbox, const SwSize&
     rw.cellMax = bbox.max;
     rw.cellXCnt = rw.cellMax.x - rw.cellMin.x;
     rw.cellYCnt = rw.cellMax.y - rw.cellMin.y;
+    rw.ySpan = 0;
     rw.outline = const_cast<SwOutline*>(outline);
     rw.bandSize = rw.bufferSize / (sizeof(Cell) * 8);  //bandSize: 64
     rw.bandShoot = 0;