diff --git a/samples/python/stitching_detailed.py b/samples/python/stitching_detailed.py
index b0cf78a759..cd3f063e35 100644
--- a/samples/python/stitching_detailed.py
+++ b/samples/python/stitching_detailed.py
@@ -387,7 +387,7 @@ def main():
     focals = []
     for cam in cameras:
         focals.append(cam.focal)
-    sorted(focals)
+    focals.sort()
     if len(focals) % 2 == 1:
         warped_image_scale = focals[len(focals) // 2]
     else: