diff --git a/kwant/continuum/discretizer.py b/kwant/continuum/discretizer.py
index 1d830400bfc4207aadff944c8b05ca2d5401889b..7eba3855dfc477567f8483798e827ff9877c741b 100644
--- a/kwant/continuum/discretizer.py
+++ b/kwant/continuum/discretizer.py
@@ -74,8 +74,8 @@ class _DiscretizedBuilder(builder.Builder):
 
         return "".join(result)
 
-    # For the Jupyter notebook:
-    def __repr_html__(self):
+    # Enable human-readable rendering in Jupyter notebooks:
+    def _repr_html_(self):
         return self.__str__()