diff --git a/lib/gitlab/database.rb b/lib/gitlab/database.rb
index 078609c86f1..55b8f888d53 100644
--- a/lib/gitlab/database.rb
+++ b/lib/gitlab/database.rb
@@ -55,12 +55,12 @@ module Gitlab
       end
     end
 
-    private
-
     def self.connection
       ActiveRecord::Base.connection
     end
 
+    private_class_method :connection
+
     def self.database_version
       row = connection.execute("SELECT VERSION()").first
 
@@ -70,5 +70,7 @@ module Gitlab
         row.first
       end
     end
+
+    private_class_method :database_version
   end
 end