diff --git a/client/lib/engine/bin/FileLib.py b/client/lib/engine/bin/FileLib.py
index 424c17a..62ce2f4 100755
--- a/client/lib/engine/bin/FileLib.py
+++ b/client/lib/engine/bin/FileLib.py
@@ -60,11 +60,11 @@ def ogCalculateChecksum (disk=None, par=None, container=None, file=None):
         return
 
     last_n_bytes = 1024*1024
-    if last_n_bytes >= os.stat ('/bin/ls').st_size:
+    if last_n_bytes >= os.stat (f).st_size:
         return ogCalculateFullChecksum (disk, par, container, file)
     with open (f, 'rb') as fd:
         fd.seek (-last_n_bytes, os.SEEK_END)
-        data = file.read()
+        data = fd.read()
     md5 = hashlib.md5(data).hexdigest()
 
     return md5