diff --git a/python-oslo.config.spec b/python-oslo.config.spec
index a9c2ed0..12a85a3 100644
--- a/python-oslo.config.spec
+++ b/python-oslo.config.spec
@@ -110,7 +110,8 @@ sed -i 's/^warning-is-error.*/warning-is-error = 0/g' setup.cfg
 %build
 %{python_build}
 
-PBR_VERSION=6.4.0 PYTHONPATH=$CWD sphinx-build -b html doc/source doc/build/html
+PBR_VERSION=6.4.0 PYTHONPATH=. \
+    sphinx-build -b html doc/source doc/build/html
 # remove the sphinx-build leftovers
 rm -rf doc/build/html/.{doctrees,buildinfo}