diff --git a/python-atomicwrites.spec b/python-atomicwrites.spec
index 564d56f..d0a674d 100644
--- a/python-atomicwrites.spec
+++ b/python-atomicwrites.spec
@@ -43,9 +43,9 @@ BuildRequires:  fdupes
 BuildRequires:  python-rpm-macros
 BuildArch:      noarch
 %if %{with doc}
+BuildRequires:  %{modern_python}-Sphinx
 BuildRequires:  %{python_module atomicwrites}
 BuildRequires:  %{python_module pytest}
-BuildRequires:  python3-Sphinx
 Provides:       %{python_module atomicwrites-doc = %{version}}
 %endif
 %python_subpackages