diff --git a/lib/validates_timeliness/railtie.rb b/lib/validates_timeliness/railtie.rb
index 0ed5f53..68cbe41 100644
--- a/lib/validates_timeliness/railtie.rb
+++ b/lib/validates_timeliness/railtie.rb
@@ -12,7 +12,7 @@ module ValidatesTimeliness
       ValidatesTimeliness.ignore_restriction_errors = !Rails.env.test?
     end
 
-    initializer "validates_timeliness.initialize_timeliness_ambiguous_date_format", :after => 'load_config_initializers' do
+    initializer "validates_timeliness.initialize_timeliness_ambiguous_date_format", :after => :load_config_initializers do
       if Timeliness.respond_to?(:ambiguous_date_format) # i.e. v0.4+
         # Set default for each new thread if you have changed the default using
         # the format switching methods.