diff --git a/lib/iris/cube.py b/lib/iris/cube.py
index 5578507d28..a15951900b 100644
--- a/lib/iris/cube.py
+++ b/lib/iris/cube.py
@@ -2652,9 +2652,6 @@ def vector_summary(
     def __str__(self):
         return self.summary()
 
-    def __unicode__(self):
-        return self.summary()
-
     def __repr__(self):
         return "<iris 'Cube' of %s>" % self.summary(
             shorten=True, name_padding=1