diff --git a/lib/cask/cli/alfred.rb b/lib/cask/cli/alfred.rb
index 8136ef592c3a..aca191ec147f 100644
--- a/lib/cask/cli/alfred.rb
+++ b/lib/cask/cli/alfred.rb
@@ -1,3 +1,5 @@
+require 'rubygems'
+
 class Cask::CLI::Alfred < Cask::CLI::Base
   DEFAULT_SCOPES = [
     '/Applications',
diff --git a/lib/cask/source/path_base.rb b/lib/cask/source/path_base.rb
index f4efc88818c2..659bcf81af34 100644
--- a/lib/cask/source/path_base.rb
+++ b/lib/cask/source/path_base.rb
@@ -1,3 +1,5 @@
+require 'rubygems'
+
 class Cask::Source::PathBase
 
   # derived classes must define method self.me?