diff --git a/ecs/vars.config b/ecs/vars.config
index 7190a41..9035c6f 100644
--- a/ecs/vars.config
+++ b/ecs/vars.config
@@ -2,6 +2,7 @@
 {pgsql, true}.
 {sqlite, true}.
 {redis, true}.
+{riak, true}
 {zlib, true}.
 {elixir, true}.
 {iconv, true}.