diff --git a/doc/modules/preprocessing.rst b/doc/modules/preprocessing.rst
index 9c2af6424a298..e7d3969d7a212 100644
--- a/doc/modules/preprocessing.rst
+++ b/doc/modules/preprocessing.rst
@@ -685,7 +685,7 @@ be encoded as all zeros::
 
 All the categories in `X_test` are unknown during transform and will be mapped
 to all zeros. This means that unknown categories will have the same mapping as
-the dropped category. :meth`OneHotEncoder.inverse_transform` will map all zeros
+the dropped category. :meth:`OneHotEncoder.inverse_transform` will map all zeros
 to the dropped category if a category is dropped and `None` if a category is
 not dropped::