diff --git a/qutebrowser/utils/usertypes.py b/qutebrowser/utils/usertypes.py
index 8fcecde67..a2c4d0429 100644
--- a/qutebrowser/utils/usertypes.py
+++ b/qutebrowser/utils/usertypes.py
@@ -141,9 +141,8 @@ class NeighborList(collections.abc.Sequence):
                 raise IndexError
         except IndexError:
             if self._mode == self.Modes.edge:
-                if offset == 0:
-                    new = self.curitem()
-                elif offset > 0:
+                assert offset != 0
+                if offset > 0:
                     new = self.lastitem()
                 else:
                     new = self.firstitem()