diff --git a/python-sure.spec b/python-sure.spec
index 55fed5e..b291bf5 100644
--- a/python-sure.spec
+++ b/python-sure.spec
@@ -40,7 +40,6 @@ BuildRequires:  make
 BuildRequires:  python3dist(sphinx)
 # development.txt: sphinx-rtd-theme==0.4.3
 BuildRequires:  python3dist(sphinx-rtd-theme)
-BuildRequires:  python3-docs
 BuildRequires:  python3-sphinx-latex
 BuildRequires:  latexmk
 %endif
@@ -62,23 +61,16 @@ Summary:        %{summary}
 %package doc
 Summary:        Documentation for Sure
 
-Requires:       python3-docs
-
 %description doc %{common_description}
 
 
 %prep
 %autosetup -p1 -n sure-%{version}
 
-# Use local inventories in intersphinx mappings.
-#
-# Currently, python-redis does not package the Sphinx documentation, so we
-# remove that mapping:
-#   'redis': ('https://redis-py.readthedocs.io/en/latest/', None)
-sed -r -i \
-    -e 's|https://docs.python.org/3?|/%{_docdir}/python3-docs/html|' \
-    -e '/redis.*https.*readthedocs/d' \
-    docs/source/conf.py
+# Drop intersphinx mappings, since we can’t download remote inventories and
+# can’t easily produce working hyperlinks from inventories in local
+# documentation packages.
+echo 'intersphinx_mapping.clear()' >> docs/conf.py
 
 cp -p '%{SOURCE1}' .