diff --git a/dev-python/more-itertools/more-itertools-4.2.0.ebuild b/dev-python/more-itertools/more-itertools-4.2.0.ebuild
index 75bf168133120..4e8145b052766 100644
--- a/dev-python/more-itertools/more-itertools-4.2.0.ebuild
+++ b/dev-python/more-itertools/more-itertools-4.2.0.ebuild
@@ -20,6 +20,7 @@ DEPEND="
 	dev-python/setuptools[${PYTHON_USEDEP}]
 	doc? (
 		dev-python/sphinx[${PYTHON_USEDEP}]
+		dev-python/sphinx_rtd_theme[${PYTHON_USEDEP}]
 	)
 	test? (
 		${RDEPEND}