diff --git a/python_src/diapOTB_S1IW.py b/python_src/diapOTB_S1IW.py
index 76dc2a2f9c2753f1d15af533c71c910893c724d3..b83ca69a896e981834b68232373e1b0205047fbc 100644
--- a/python_src/diapOTB_S1IW.py
+++ b/python_src/diapOTB_S1IW.py
@@ -1,3 +1,4 @@
+
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 #
@@ -87,7 +88,7 @@ if __name__ == "__main__":
             if 'optram' in dict_Global['parameter']:
                 ram =  str(dict_Global['parameter']['optram'])
                 if int(ram) > 4000 : 
-                    ram = 4000
+                    ram = str(4000)
 
         # Pre_Processing
         ml_range = dict_PreProcessing['parameter']['ML_range']