diff --git a/lib/mongo/collection.rb b/lib/mongo/collection.rb
index f99087c..2074aee 100644
--- a/lib/mongo/collection.rb
+++ b/lib/mongo/collection.rb
@@ -538,7 +538,7 @@ module Mongo
 
       result = @db.command(group_command)
 
-      if result["ok"] == 1
+      if Mongo::Support.ok?(result)
         result["retval"]
       else
         raise OperationFailure, "group command failed: #{result['errmsg']}"
diff --git a/lib/mongo/connection.rb b/lib/mongo/connection.rb
index 6236392..41bcade 100644
--- a/lib/mongo/connection.rb
+++ b/lib/mongo/connection.rb
@@ -423,7 +423,8 @@ module Mongo
 
           # If we're connected to master, set the @host and @port
           result = self['admin'].command({:ismaster => 1}, :check_response => false, :sock => socket)
-          if result['ok'] == 1 && ((is_master = result['ismaster'] == 1) || @slave_ok)
+          if Mongo::Support.ok?(result) &&
+              ((is_master = result['ismaster'] == 1) || @slave_ok)
             @host, @port = host, port
             apply_saved_authentication
           end
diff --git a/lib/mongo/cursor.rb b/lib/mongo/cursor.rb
index a0284c6..41d5962 100644
--- a/lib/mongo/cursor.rb
+++ b/lib/mongo/cursor.rb
@@ -103,7 +103,7 @@ module Mongo
                             "query",  @selector,
                             "fields", @fields]
       response = @db.command(command)
-      return response['n'].to_i if response['ok'] == 1
+      return response['n'].to_i if Mongo::Support.ok?(response)
       return 0 if response['errmsg'] == "ns missing"
       raise OperationFailure, "Count failed: #{response['errmsg']}"
     end
diff --git a/lib/mongo/db.rb b/lib/mongo/db.rb
index 0cdc006..e9aea98 100644
--- a/lib/mongo/db.rb
+++ b/lib/mongo/db.rb
@@ -217,8 +217,7 @@ module Mongo
       oh = BSON::OrderedHash.new
       oh[:create] = name
       doc = command(oh.merge(options || {}))
-      ok = doc['ok']
-      return Collection.new(self, name, @pk_factory) if ok.kind_of?(Numeric) && (ok.to_i == 1 || ok.to_i == 0)
+      return Collection.new(self, name, @pk_factory) if ok?(doc)
       raise MongoDBError, "Error creating collection: #{doc.inspect}"
     end
 
@@ -427,8 +426,7 @@ module Mongo
     #
     # @return [Boolean]
     def ok?(doc)
-      ok = doc['ok']
-      ok.kind_of?(Numeric) && ok.to_i == 1
+      Mongo::Support.ok?(doc)
     end
 
     # Send a command to the database.
diff --git a/lib/mongo/util/support.rb b/lib/mongo/util/support.rb
index 7ce51a0..d8fa769 100644
--- a/lib/mongo/util/support.rb
+++ b/lib/mongo/util/support.rb
@@ -68,5 +68,15 @@ module Mongo
             "[['field1', '(ascending|descending)'], ['field2', '(ascending|descending)']]"
       end
     end
+
+    # Determine if a database command has succeeded by
+    # checking the document response.
+    #
+    # @param [Hash] doc
+    #
+    # @return [Boolean] true if the 'ok' key is either 1 or *true*.
+    def ok?(doc)
+      doc['ok'] == 1.0 || doc['ok'] == true
+    end
   end
 end
diff --git a/test/connection_test.rb b/test/connection_test.rb
index 238faf0..3816616 100644
--- a/test/connection_test.rb
+++ b/test/connection_test.rb
@@ -21,7 +21,7 @@ class TestConnection < Test::Unit::TestCase
   def test_server_info
     server_info = @mongo.server_info
     assert server_info.keys.include?("version")
-    assert_equal 1.0, server_info["ok"]
+    assert Mongo::Support.ok?(server_info)
   end
 
   def test_server_version
@@ -71,7 +71,7 @@ class TestConnection < Test::Unit::TestCase
     end
 
     result = @mongo.copy_database('old', 'new', 'localhost', 'bob', 'secret')
-    assert result['ok'].to_i == 1
+    assert Mongo::Support.ok?(result)
 
     @mongo.drop_database('old')
     @mongo.drop_database('new')
diff --git a/test/db_test.rb b/test/db_test.rb
index 7667d1b..1258c30 100644
--- a/test/db_test.rb
+++ b/test/db_test.rb
@@ -158,7 +158,7 @@ class DBTest < Test::Unit::TestCase
     end
 
     result = @@db.command({:non_command => 1}, :check_response => false)
-    assert_equal 0, result['ok'].to_i
+    assert !Mongo::Support.ok?(result)
   end
 
   def test_error
diff --git a/test/unit/db_test.rb b/test/unit/db_test.rb
index b262589..5a69deb 100644
--- a/test/unit/db_test.rb
+++ b/test/unit/db_test.rb
@@ -62,7 +62,7 @@ class DBTest < Test::Unit::TestCase
 
       should "raise an error if collection creation fails" do
         @db.expects(:collection_names).returns([])
-        @db.expects(:command).returns({})
+        @db.expects(:command).returns({'ok' => 0})
         assert_raise Mongo::MongoDBError do
           @db.create_collection("foo")
         end