diff --git a/python/obitools3/obidms/_obidmscolumn_seq.pyx b/python/obitools3/obidms/_obidmscolumn_seq.pyx
index 0819d82..7e96eb8 100644
--- a/python/obitools3/obidms/_obidmscolumn_seq.pyx
+++ b/python/obitools3/obidms/_obidmscolumn_seq.pyx
@@ -27,7 +27,7 @@ cdef class OBIDMS_column_seq(OBIDMS_column):
         if strcmp(value, OBISeq_NA) == 0 :
             result = None
         else :
-            result = bytes2str(value)
+            result = <bytes> value
             free(value)
         return result
 
@@ -64,10 +64,12 @@ cdef class OBIDMS_column_multi_elts_seq(OBIDMS_column_multi_elts):
         if strcmp(value, OBISeq_NA) == 0 :
             result = None
         else :
-            result = bytes2str(value)
+            result = <bytes> value
+            # Be careful, we have to be sure that the cast copy the data in the python structure
             free(value)
         return result
 
+    
     cpdef object get_line(self, index_t line_nb) :
         cdef char*   value
         cdef object  value_in_result
@@ -83,7 +85,7 @@ cdef class OBIDMS_column_multi_elts_seq(OBIDMS_column_multi_elts):
             if strcmp(value, OBISeq_NA) == 0 :
                 value_in_result = None
             else :
-                value_in_result = bytes2str(value)
+                value_in_result = <bytes> value
                 free(value)    
             result[self.elements_names[i]] = value_in_result
             if all_NA and (value_in_result is not None) :