diff --git a/src/@dseries/flip_.m b/src/@dseries/flip_.m
index 3945fd5ff61e69421cdfa0d93f15a75fc099761e..5207b74ea8e9063b1828479ce5455d0d7fb6aaa7 100644
--- a/src/@dseries/flip_.m
+++ b/src/@dseries/flip_.m
@@ -34,7 +34,7 @@ for i=1:vobs(o)
     end
 end
 
-o.data = flip(o.data);
+o.data = flipud(o.data);
 
 return
 %@test:1