diff --git a/src/ansi-tests/lists155.lisp b/src/ansi-tests/lists155.lisp
index 1c6cc5b17..0cc7d20c9 100644
--- a/src/ansi-tests/lists155.lisp
+++ b/src/ansi-tests/lists155.lisp
@@ -116,8 +116,8 @@
 (my-assert
  (set-difference '(a b c d e)
 		 '(d b e))
- #+(or xcl allegro gcl cmu sbcl ecl) (c a)
- #+(or clisp (and akcl (not gcl))) (a c)
+ #+(or xcl allegro gcl cmu sbcl) (c a)
+ #+(or clisp ecl (and akcl (not gcl))) (a c)
  #-(or xcl clisp akcl allegro cmu sbcl ecl) unknown)
 
 (my-assert