diff --git a/dev-python/outcome/outcome-1.2.0.ebuild b/dev-python/outcome/outcome-1.2.0.ebuild
index e63ca640f4742..a6fa44c8cb709 100644
--- a/dev-python/outcome/outcome-1.2.0.ebuild
+++ b/dev-python/outcome/outcome-1.2.0.ebuild
@@ -34,4 +34,4 @@ BDEPEND="
 "
 
 distutils_enable_tests pytest
-distutils_enable_sphinx docs/source dev-python/sphinxcontrib-trio
+distutils_enable_sphinx docs/source dev-python/sphinxcontrib-trio dev-python/sphinx_rtd_theme