diff --git a/python/obitools3/dms/column/column.pyx b/python/obitools3/dms/column/column.pyx
index b4a3847..5451f2d 100644
--- a/python/obitools3/dms/column/column.pyx
+++ b/python/obitools3/dms/column/column.pyx
@@ -196,8 +196,7 @@ cdef class Column(OBIWrapper) :
      
      
     def __iter__(self):
-        cdef index_t line_nb  
- 
+        cdef index_t line_nb
         for line_nb in range(self.lines_used):
             yield self[line_nb]
 
@@ -211,8 +210,8 @@ cdef class Column(OBIWrapper) :
   
                  
     def __str__(self) :
-        cdef str         to_print
-        cdef Column_line line
+        cdef str    to_print
+        cdef object line
         to_print = ''
         for line in self :
             to_print = to_print + str(line) + "\n"