diff --git a/base_report_to_printer/printing.py b/base_report_to_printer/printing.py
index 30b728e..10c2b33 100755
--- a/base_report_to_printer/printing.py
+++ b/base_report_to_printer/printing.py
@@ -240,7 +240,7 @@ class report_xml(osv.osv):
             os.close(fd)
         printer_system_name = ''
         if printer:
-            if isinstance(printer, (str,unicode)):
+            if isinstance(printer, (basestring)):
                 printer_system_name = printer
             else:
                 printer_system_name = printer.system_name