diff --git a/src/tablib/packages/dbfpy/utils.py b/src/tablib/packages/dbfpy/utils.py
index b3388a7..284d3ee 100644
--- a/src/tablib/packages/dbfpy/utils.py
+++ b/src/tablib/packages/dbfpy/utils.py
@@ -158,9 +158,6 @@ class _InvalidValue:
     def __str__(self):
         return ""
 
-    def __unicode__(self):
-        return ""
-
     def __repr__(self):
         return "<INVALID>"