diff --git a/examples/img/fft_li.py b/examples/img/fft_li.py
index 983a45c92a4805501369b1a6e1c0237ea49d1a69..9ee75c6fb2007d9c583314f8fc886fc020eff61f 100644
--- a/examples/img/fft_li.py
+++ b/examples/img/fft_li.py
@@ -1,7 +1,7 @@
 import sys
 import ost.img.alg
 if len(sys.argv)<2:
-images=io.LoadImageList(['square.png'])  
+  images=io.LoadImageList(['square.png'])  
 else:
   images=io.LoadImageList(sys.argv[1:])
 viewers=[]