diff --git a/example/eigen.py b/example/eigen.py
index 9c4e1ef16..57c516a15 100644
--- a/example/eigen.py
+++ b/example/eigen.py
@@ -24,6 +24,8 @@ ref = np.array(
 def check(mat):
     return 'OK' if np.sum(mat - ref) == 0 else 'NOT OK'
 
+print("should_give_NOT_OK = %s" % check(ref[:, ::-1]))
+
 print("fixed_r = %s" % check(fixed_r()))
 print("fixed_c = %s" % check(fixed_c()))
 print("pt_r(fixed_r) = %s" % check(fixed_passthrough_r(fixed_r())))
diff --git a/example/eigen.ref b/example/eigen.ref
index bac73be9f..03091cc24 100644
--- a/example/eigen.ref
+++ b/example/eigen.ref
@@ -1,3 +1,4 @@
+should_give_NOT_OK = NOT OK
 fixed_r = OK
 fixed_c = OK
 pt_r(fixed_r) = OK