diff --git a/Database/CoolConvUtilities/python/AtlCoolTool.py b/Database/CoolConvUtilities/python/AtlCoolTool.py
index 96b202ae21e23029709960d616beb4ca8e734509..81074bb0e37009688c78afc28a8591e5a44a489b 100755
--- a/Database/CoolConvUtilities/python/AtlCoolTool.py
+++ b/Database/CoolConvUtilities/python/AtlCoolTool.py
@@ -368,7 +368,7 @@ class AtlCoolTool:
             i+= " ["+spec[idx].name() + " (" + typename + ") : "
             if (typename.startswith("Blob")):
                 blob=payload[idx]
-                i+= "size=%i,chk=%i" % (blob.size(),crc32(blob.read().encode()))
+                i+= "size=%i,chk=%i" % (blob.size(),crc32(blob.read()))
             else:
                 i+= str(payload[idx])
             i+="]"