diff --git a/kernel/Interval.st b/kernel/Interval.st
index 7396e77..bd3c040 100644
--- a/kernel/Interval.st
+++ b/kernel/Interval.st
@@ -138,7 +138,7 @@ members that my instance represents.'>
 	^Interval 
 	    from: (self at: self size)
 	    to: (self at: 1)
-	    by: self step negated
+	    by: step negated
     ]
 
     species [