diff --git a/dev-python/ascim/ascim-9999.ebuild b/dev-python/ascim/ascim-9999.ebuild
index 5b72e2a7a7..ead11b8bf6 100644
--- a/dev-python/ascim/ascim-9999.ebuild
+++ b/dev-python/ascim/ascim-9999.ebuild
@@ -15,7 +15,7 @@ esac
 
 PYTHON_COMPAT=( python3_{6,7,8} )
 inherit distutils-r1
-distutils_enable_sphinx docs
+distutils_enable_sphinx docs dev-python/sphinx_rtd_theme
 
 DESCRIPTION="Manipulate ASCII art as you would do with raster images"
 HOMEPAGE="${EGIT_REPO_URI}"