diff --git a/lib/will_paginate/deprecation.rb b/lib/will_paginate/deprecation.rb
index 848ecf8f1..21b167c09 100644
--- a/lib/will_paginate/deprecation.rb
+++ b/lib/will_paginate/deprecation.rb
@@ -31,8 +31,8 @@ def []=(key, value)
       super
     end
 
-    def deprecate_key(*keys)
-      message = block_given? ? Proc.new : keys.pop
+    def deprecate_key(*keys, &block)
+      message = block_given? ? block : keys.pop
       Array(keys).each { |key| @deprecated[key] = message }
     end