diff --git a/tryton/gui/window/win_export.py b/tryton/gui/window/win_export.py
index ab3221c20d..07ec4c6b65 100644
--- a/tryton/gui/window/win_export.py
+++ b/tryton/gui/window/win_export.py
@@ -154,14 +154,11 @@ class WinExport(WinCSV):
 
             for name, field, string_ in items:
                 path = prefix_field + name
-                long_string = string_
-                if prefix_field:
-                    long_string = prefix_name + string_
                 node = self.model1.insert(parent_node, 0,
                     [string_, path])
+                string_ = prefix_name + string_
 
-                self.fields[path] = (string_, long_string,
-                    field.get('relation'))
+                self.fields[path] = (string_, field.get('relation'))
                 # Insert relation only to real field
                 if '.' not in name:
                     if field.get('relation'):
@@ -178,7 +175,7 @@ class WinExport(WinCSV):
         child = self.model1.iter_children(iter)
         if self.model1.get_value(child, 0) is None:
             prefix_field = self.model1.get_value(iter, 1)
-            string_, long_string, relation = self.fields[prefix_field]
+            string_, relation = self.fields[prefix_field]
             self.model_populate(self._get_fields(relation), iter,
                 prefix_field + '/', string_ + '/')
             self.model1.remove(child)
@@ -306,10 +303,10 @@ class WinExport(WinCSV):
             self.sel_field(name)
 
     def sel_field(self, name):
-        _, long_string, relation = self.fields[name]
+        string_, relation = self.fields[name]
         if relation:
             name += '/rec_name'
-        self.model2.append((long_string, name))
+        self.model2.append((string_, name))
 
     def response(self, dialog, response):
         if response == Gtk.ResponseType.OK: