diff --git a/kea.spec b/kea.spec
index 7f64b20..80701ad 100644
--- a/kea.spec
+++ b/kea.spec
@@ -59,6 +59,7 @@ BuildRequires: python3-devel
 #BuildRequires: elinks asciidoc plantuml
 BuildRequires: systemd
 BuildRequires: python3-sphinx
+BuildRequires: python3-sphinx_rtd_theme
 
 Requires: kea-libs%{?_isa} = %{version}-%{release}
 Requires(post): systemd