diff --git a/python/obitools3/dms/view/view.pyx b/python/obitools3/dms/view/view.pyx
index b354b19..58a8c3d 100755
--- a/python/obitools3/dms/view/view.pyx
+++ b/python/obitools3/dms/view/view.pyx
@@ -345,7 +345,7 @@ cdef class View(OBIWrapper) :
                                        nb_elements_per_line=new_nb_elements_per_line, elements_names=new_elements_names, 
                                        dict_column=(new_nb_elements_per_line>1), comments=old_column.comments, alias=column_name_b+tobytes('___new___'))
         
-        switch_to_dict = old_column.nb_elements_per_line == 1 and new_nb_elements_per_line > 1
+        switch_to_dict = not old_column.dict_column and new_nb_elements_per_line > 1
         ori_key = old_column._elements_names[0]
         
         for i in range(length) :