diff --git a/src/renderer/sw_engine/tvgSwRenderer.cpp b/src/renderer/sw_engine/tvgSwRenderer.cpp
index faeb7a22..b9f0a06c 100644
--- a/src/renderer/sw_engine/tvgSwRenderer.cpp
+++ b/src/renderer/sw_engine/tvgSwRenderer.cpp
@@ -86,7 +86,7 @@ struct SwShapeTask : SwTask
        Additionally, the stroke style should not be dashed. */
     bool antialiasing(float strokeWidth)
     {
-        return strokeWidth < 2.0f || rshape->stroke->dashCnt > 0 || rshape->stroke->strokeFirst || rshape->strokeTrim();
+        return strokeWidth < 2.0f || rshape->stroke->dashCnt > 0 || rshape->stroke->strokeFirst || rshape->strokeTrim() || rshape->stroke->color[3] < 255;;
     }
 
     float validStrokeWidth()
diff --git a/src/renderer/tvgShape.h b/src/renderer/tvgShape.h
index eccae0d8..2aa255fc 100644
--- a/src/renderer/tvgShape.h
+++ b/src/renderer/tvgShape.h
@@ -296,6 +296,7 @@ struct Shape::Impl
         if (!rs.stroke) rs.stroke = new RenderStroke();
         if (rs.stroke->fill && rs.stroke->fill != p) delete(rs.stroke->fill);
         rs.stroke->fill = p;
+        rs.stroke->color[3] = 0;
 
         flag |= RenderUpdateFlag::Stroke;
         flag |= RenderUpdateFlag::GradientStroke;