diff --git a/kernel/common/range19.rb b/kernel/common/range19.rb
index 084f462a12..bc2406e67c 100644
--- a/kernel/common/range19.rb
+++ b/kernel/common/range19.rb
@@ -1,6 +1,7 @@
 # -*- encoding: us-ascii -*-
 
 class Range
+  # Don't use `alias_method` for #===. `Delegate to #include?` is a spec.
   def ===(value)
     include?(value)
   end
@@ -83,6 +84,6 @@ def min(&block)
   protected
 
   def can_iterate_from?(object)
-    first.respond_to?(:succ) && !object.kind_of?(Time)
+    object.respond_to?(:succ) && !object.kind_of?(Time)
   end
 end