diff --git a/samples/python/watershed.py b/samples/python/watershed.py
index 1725acc095..0ea43bea55 100755
--- a/samples/python/watershed.py
+++ b/samples/python/watershed.py
@@ -105,3 +105,5 @@ if __name__ == "__main__":
 
             cv.AddWeighted(wshed, 0.5, img_gray, 0.5, 0, wshed)
             cv.ShowImage("watershed transform", wshed)
+    cv.DestroyAllWindows()
+