diff --git a/api/onnx_web/chain/upscale_outpaint.py b/api/onnx_web/chain/upscale_outpaint.py
index 329d1c09..deacc055 100644
--- a/api/onnx_web/chain/upscale_outpaint.py
+++ b/api/onnx_web/chain/upscale_outpaint.py
@@ -115,7 +115,7 @@ def upscale_outpaint(
     if overlap == 0:
         logger.debug("outpainting with 0 margin, using grid tiling")
         output = process_tile_grid(source_image, SizeChart.auto, 1, [outpaint])
-    if border.left == border.right and border.top == border.bottom:
+    elif border.left == border.right and border.top == border.bottom:
         logger.debug("outpainting with an even border, using spiral tiling")
         output = process_tile_spiral(
             source_image, SizeChart.auto, 1, [outpaint], overlap=overlap