diff --git a/python-nss.spec b/python-nss.spec
index aaadb88..ed4a244 100644
--- a/python-nss.spec
+++ b/python-nss.spec
@@ -30,13 +30,13 @@ Patch0:         0001-Rename-DSA-RSA-PublicKey-to-Py-DSA-RSA-PublicKey.patch
 # PATCH-FIX-UPSTREAM sphinx.patch bsc#[0-9]+ mcepl@suse.com
 # this patch makes things totally awesome
 Patch1:         sphinx.patch
+BuildRequires:  %{python_module Sphinx}
 BuildRequires:  %{python_module devel}
 BuildRequires:  %{python_module docutils}
 BuildRequires:  %{python_module setuptools}
 BuildRequires:  fdupes
 BuildRequires:  mozilla-nspr-devel
 BuildRequires:  mozilla-nss-devel
-BuildRequires:  python3-Sphinx
 # Required for tests
 BuildRequires:  mozilla-nss-tools
 %python_subpackages
@@ -59,8 +59,7 @@ HTML Documentation and examples for %name.
 %autosetup -p1 -n python-nss-%{version}
 
 %build
-%python_build
-python3 setup.py build_doc
+%python_build build_doc
 rm -rf build/sphinx/html/.buildinfo
 
 %install