diff --git a/Modules/Wrappers/SWIG/test/python/PythonNumpyTest.py b/Modules/Wrappers/SWIG/test/python/PythonNumpyTest.py
index 228e176b92f1a16a598ea34b5966074d0337a4fe..91a7c1f04267e8310968decfbaaa7b0be47be4a1 100644
--- a/Modules/Wrappers/SWIG/test/python/PythonNumpyTest.py
+++ b/Modules/Wrappers/SWIG/test/python/PythonNumpyTest.py
@@ -52,5 +52,5 @@ Smoothing = otbApplication.Registry.CreateApplication("Smoothing")
 #take numpy output from Convert application and feed into Smoothing
 Smoothing.SetVectorImageFromNumpyArray("in", ConvertOut)
 Smoothing.SetParameterString("type", 'anidif')
-Smoothing.SetParameterString("out", prefix + "SmoothingOut.png")
+Smoothing.SetParameterString("out", argv[2])
 Smoothing.ExecuteAndWriteOutput()