diff --git a/python-shapely.spec b/python-shapely.spec
index 5c990bc..9423110 100644
--- a/python-shapely.spec
+++ b/python-shapely.spec
@@ -106,13 +106,11 @@ sed -r  \
 %pyproject_wheel
 
 %if %{with doc_pdf}
-# Note that this will use the “un-built” copy without compiled vectorized
-# extensions. Since these are optional, this is fine for the documentation.
-#
-# See https://src.fedoraproject.org/rpms/python-asyncpg for an example of
-# installing the built wheel in a temporary directory and adding that to the
-# PYTHONPATH for the documentation build.
-%make_build -C docs latex SPHINXOPTS='%{?_smp_mflags}'
+# We can build documentation without the optional compiled vectorized
+# extensions, but we use the “built” copy of the package instead since it easy
+# enough to do so.
+PYTHONPATH="%{pyproject_build_lib}" \
+    %make_build -C docs latex SPHINXOPTS='%{?_smp_mflags}'
 %make_build -C docs/_build/latex LATEXMKOPTS='-quiet'
 %endif