diff --git a/src/multiselectfield/db/fields.py b/src/multiselectfield/db/fields.py
index 3188296..2aa1c6a 100644
--- a/src/multiselectfield/db/fields.py
+++ b/src/multiselectfield/db/fields.py
@@ -23,7 +23,7 @@ from django.core import exceptions
 
 from ..forms.fields import MultiSelectFormField
 
-if sys.version_info.major == 2:
+if sys.version_info[0] == 2:
     string = basestring
     string_type = unicode
 else: