diff --git a/paludis/keywords.conf b/paludis/keywords.conf
index 496035b..69e3bb8 100644
--- a/paludis/keywords.conf
+++ b/paludis/keywords.conf
@@ -775,3 +775,7 @@ dev-libs/protobuf-c ~amd64
 ~dev-libs/glib-2.42.1 ~amd64
 ~dev-util/gdbus-codegen-2.42.1 ~amd64
 desktop-misc/gpaste ~amd64
+
+# for mediastreamer
+~media-libs/libmatroska-1.4.2 ~amd64
+~dev-libs/libebml-1.3.1 ~amd64