diff --git a/reuse.spec b/reuse.spec
index 4df2a44..34d266d 100644
--- a/reuse.spec
+++ b/reuse.spec
@@ -24,6 +24,7 @@ BuildRequires:  %{py3_dist python-debian}
 BuildRequires:  %{py3_dist requests}
 # Documentation
 BuildRequires:  %{py3_dist Sphinx}
+BuildRequires:  %{py3_dist sphinx_rtd_theme}
 BuildRequires:  %{py3_dist sphinx-autodoc-typehints}
 BuildRequires:  %{py3_dist sphinxcontrib-apidoc}
 BuildRequires:  %{py3_dist recommonmark}