diff --git a/build/pkgs/sage_docbuild/src/setup.cfg b/build/pkgs/sage_docbuild/src/setup.cfg
index f847e686606..99b54e9c310 100644
--- a/build/pkgs/sage_docbuild/src/setup.cfg
+++ b/build/pkgs/sage_docbuild/src/setup.cfg
@@ -23,3 +23,11 @@ classifiers =
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: Implementation :: CPython
     Topic :: Scientific/Engineering :: Mathematics
+
+[options]
+packages =
+    sage_docbuild
+    sage_docbuild.ext
+
+install_requires =
+    sphinx