diff --git a/Script/utils.py b/Script/utils.py
index 579d27a3ac7bf254a5c91a95df4fcf8d62e00543..b3203376c316cd1f2b18917c258402f8f8c4cd4d 100644
--- a/Script/utils.py
+++ b/Script/utils.py
@@ -72,7 +72,7 @@ def castorinfo(castorfile, castorenv, logger):
             size = int(splitted[4])
 
             id = splitted.index('AD')
-            checksum = nslsOut.split()[id+1]
+            checksum = (nslsOut.split()[id+1]).zfill(8)
             
         except ValueError:
             size = checksum = None