diff --git a/runes.asd b/runes.asd
index 086eba9..858f554 100644
--- a/runes.asd
+++ b/runes.asd
@@ -57,4 +57,5 @@
      #-x&y-streams-are-stream (:file "xstream")
      #-x&y-streams-are-stream (:file "ystream")
      #+x&y-streams-are-stream (:file #+scl "stream-scl")
-     ))
+     )
+    :depends-on (#-scl :trivial-gray-streams))