diff --git a/kernel/common/enumerable.rb b/kernel/common/enumerable.rb
index 9fb2f34..8a4008f 100644
--- a/kernel/common/enumerable.rb
+++ b/kernel/common/enumerable.rb
@@ -457,9 +457,11 @@ module Enumerable
   #   %w[ant bear cat].all? { |word| word.length >= 4}   #=> false
   #   [ nil, true, 99 ].all?                             #=> false

-  def all?(&prc)
-    prc = Proc.new { |obj| obj } unless block_given?
-    each { |o| return false unless prc.call(o) }
+  def all?
+    each do |o|
+      ret = yield(o)
+      return false unless ret
+    end
     true
   end