diff --git a/activesupport/lib/active_support/breakpoint.rb b/activesupport/lib/active_support/breakpoint.rb
index 785dac7596..8207117ced 100755
--- a/activesupport/lib/active_support/breakpoint.rb
+++ b/activesupport/lib/active_support/breakpoint.rb
@@ -460,6 +460,11 @@ module IRB #:nodoc:
       old_CurrentContext
     end
   end
+
+  class << self
+    alias :old_parse_opts :parse_opts
+    remove_method :parse_opts
+  end
   def IRB.parse_opts() end
 
   class Context #:nodoc:
diff --git a/activesupport/lib/active_support/deprecation.rb b/activesupport/lib/active_support/deprecation.rb
index 845fb4d62b..22ff90642a 100644
--- a/activesupport/lib/active_support/deprecation.rb
+++ b/activesupport/lib/active_support/deprecation.rb
@@ -65,6 +65,9 @@ module ActiveSupport
     mattr_accessor :behavior
     self.behavior = default_behavior
 
+    # Warnings are not silenced by default.
+    self.silenced = false
+
     module ClassMethods
       # Declare that a method has been deprecated.
       def deprecate(*method_names)