diff --git a/modules/base/pymod/table.py b/modules/base/pymod/table.py
index 8198b4041321e5e22913d57c0363aaf69bc94840..c4031d0107865bf2180afdac7056e9b4750a4782 100644
--- a/modules/base/pymod/table.py
+++ b/modules/base/pymod/table.py
@@ -219,7 +219,7 @@ class Table(object):
   
   
   def __init__(self, col_names=None, col_types=None, **kwargs):
-    self.col_names=col_names
+    self.col_names=list(col_names)
     self.comment=''
     self.name=''