diff --git a/Gemfile b/Gemfile
index 9a7b19a40f..0bf6b562eb 100755
--- a/Gemfile
+++ b/Gemfile
@@ -1,10 +1,13 @@
 source 'http://rubygems.org'
 
+# Need 3+ for ActiveSupport::Concern
+gem 'activesupport', '>= 3.0.0'
+
 group :development do
-  # running documention generation tasks
+  # running documentation generation tasks
   gem 'rake'
-  # Markdown formatting for yara
+  # Markdown formatting for yard
   gem 'redcarpet'
-  # generating documention
+  # generating documentation
   gem 'yard'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 6a0bbe0f53..ac58c9b705 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,6 +1,11 @@
 GEM
   remote: http://rubygems.org/
   specs:
+    activesupport (3.2.8)
+      i18n (~> 0.6)
+      multi_json (~> 1.0)
+    i18n (0.6.1)
+    multi_json (1.3.6)
     rake (0.9.2.2)
     redcarpet (2.1.1)
     yard (0.8.2.1)
@@ -9,6 +14,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  activesupport (>= 3.0.0)
   rake
   redcarpet
   yard
diff --git a/lib/msf/core/module_manager/cache.rb b/lib/msf/core/module_manager/cache.rb
index f9138e48a0..4800679042 100644
--- a/lib/msf/core/module_manager/cache.rb
+++ b/lib/msf/core/module_manager/cache.rb
@@ -1,3 +1,8 @@
+#
+# Gems
+#
+require 'active_support/concern'
+
 # Concerns the module cache maintained by the {Msf::ModuleManager}.
 module Msf::ModuleManager::Cache
   extend ActiveSupport::Concern
diff --git a/lib/msf/core/module_manager/loading.rb b/lib/msf/core/module_manager/loading.rb
index 8cb1b90c3b..3f69c32654 100644
--- a/lib/msf/core/module_manager/loading.rb
+++ b/lib/msf/core/module_manager/loading.rb
@@ -1,3 +1,11 @@
+#
+# Gems
+#
+require 'active_support/concern'
+
+#
+# Project
+#
 require 'msf/core/modules/loader/archive'
 require 'msf/core/modules/loader/directory'
 
diff --git a/lib/msf/core/module_manager/module_paths.rb b/lib/msf/core/module_manager/module_paths.rb
index 455368afd8..83d91ec88d 100644
--- a/lib/msf/core/module_manager/module_paths.rb
+++ b/lib/msf/core/module_manager/module_paths.rb
@@ -1,3 +1,8 @@
+#
+# Gems
+#
+require 'active_support/concern'
+
 # Deals with module paths in the {Msf::ModuleManager}
 module Msf::ModuleManager::ModulePaths
   extend ActiveSupport::Concern
diff --git a/lib/msf/core/module_manager/module_sets.rb b/lib/msf/core/module_manager/module_sets.rb
index 028db8ed08..5d6da9301a 100644
--- a/lib/msf/core/module_manager/module_sets.rb
+++ b/lib/msf/core/module_manager/module_sets.rb
@@ -1,3 +1,12 @@
+#
+# Gems
+#
+require 'active_support/concern'
+
+#
+# Project
+#
+
 # Defines the MODULE_* constants
 require 'msf/core/constants'