diff --git a/lib/app_config.rb b/lib/app_config.rb
index 77f1ef101..8577adfc4 100644
--- a/lib/app_config.rb
+++ b/lib/app_config.rb
@@ -35,7 +35,7 @@ class AppConfig
     end
     if File.exist? "#{Rails.root}/config/app_config.yml"
       all_envs_custom = load_config_yaml "#{Rails.root}/config/app_config.yml"
-      all_envs.merge!(all_envs_custom)
+      all_envs.deep_merge!(all_envs_custom)
     else
       unless Rails.env == "development" || Rails.env == "test"
         $stderr.puts "WARNING: No config/app_config.yml found! Look at config/app_config.yml.example for help."
diff --git a/script/get_config.rb b/script/get_config.rb
index fe0449297..759238f34 100755
--- a/script/get_config.rb
+++ b/script/get_config.rb
@@ -8,6 +8,7 @@ require 'yaml'
 
 require 'active_support/core_ext/class/attribute_accessors'
 require 'active_support/core_ext/hash/keys'
+require 'active_support/core_ext/hash/deep_merge'
 
 class Rails
   def self.root