diff --git a/pyren3/mod_ddt_ecu.py b/pyren3/mod_ddt_ecu.py
index 241b744..be847ef 100644
--- a/pyren3/mod_ddt_ecu.py
+++ b/pyren3/mod_ddt_ecu.py
@@ -1058,7 +1058,7 @@ class DDTECU():
 
   def bukva( self, bt, l, sign=False):
     S1 = chr ((bt - l) % 26 + ord ('A'))
-    ex = int (bt - l) / 26
+    ex = int (bt - l) // 26
     if ex:
       S2 = chr ((ex - 1) % 26 + ord ('A'))
       S1 = S2 + S1
diff --git a/pyren3/mod_ddt_screen.py b/pyren3/mod_ddt_screen.py
index da277ac..9911c72 100644
--- a/pyren3/mod_ddt_screen.py
+++ b/pyren3/mod_ddt_screen.py
@@ -1157,7 +1157,7 @@ class DDTScreen (tk.Frame):
                         cs = cs + l_Unit + '","'
                         cs = cs + l_header + '"\n'
 
-                        fcsv.write(cs.encode('utf-8'))
+                        fcsv.write(cs)
         fcsv.close()
         del(usedmnemo)