diff --git a/lib/mongo/collection.rb b/lib/mongo/collection.rb
index 05a89a8..c96c41a 100644
--- a/lib/mongo/collection.rb
+++ b/lib/mongo/collection.rb
@@ -462,19 +462,9 @@ module Mongo
     # @param [String, BSON::Code] finalize :: optional. a JavaScript function that receives and modifies
     #              each of the resultant grouped objects. Available only when group is run
     #              with command set to true.
-    # @param [Nil] deprecated this param in a placeholder for a deprecated param. It will be removed
-    #   in the next release.
     #
     # @return [Array] the grouped items.
-    def group(key, condition, initial, reduce, finalize=nil, deprecated=nil)
-
-      # Warn of changed API post eval deprecation.
-      if finalize == true || finalize == false || deprecated
-        warn "The API for Collection#group has changed. 'Finalize' is now the fifth parameter, " +
-          "since it's no longer necessary to specify whether #group is run as a command. " +
-          "See http://api.mongodb.org/ruby/current/Mongo/Collection.html#group-instance_method for details."
-      end
-
+    def group(key, condition, initial, reduce, finalize=nil)
       reduce = BSON::Code.new(reduce) unless reduce.is_a?(BSON::Code)
 
       group_command = {
@@ -499,9 +489,6 @@ module Mongo
         group_command["group"][key_type] = key_value
       end
 
-      # only add finalize if specified
-      # check to see if users have sent the finalizer as the last argument.
-      finalize = deprecated if deprecated.is_a?(String) || deprecated.is_a?(BSON::Code)
       finalize = BSON::Code.new(finalize) if finalize.is_a?(String)
       if finalize.is_a?(BSON::Code)
         group_command['group']['finalize'] = finalize
diff --git a/test/db_api_test.rb b/test/db_api_test.rb
index bdbb6ed..add7156 100644
--- a/test/db_api_test.rb
+++ b/test/db_api_test.rb
@@ -545,7 +545,7 @@ class DBAPITest < Test::Unit::TestCase
     assert_equal 1, test.group([], {"a" => {"$gt" => 1}}, {"count" => 0}, "function (obj, prev) { prev.count++; }")[0]["count"]
 
     finalize = "function (obj) { obj.f = obj.count - 1; }"
-    assert_equal 2, test.group([], {}, {"count" => 0}, "function (obj, prev) { prev.count++; }", true, finalize)[0]["f"]
+    assert_equal 2, test.group([], {}, {"count" => 0}, "function (obj, prev) { prev.count++; }", finalize)[0]["f"]
 
     test.insert("a" => 2, "b" => 3)
     expected = [{"a" => 2, "count" => 2},