diff --git a/lib/rubygems/commands/unpack_command.rb b/lib/rubygems/commands/unpack_command.rb
index f7ffea3e95..938db701e5 100644
--- a/lib/rubygems/commands/unpack_command.rb
+++ b/lib/rubygems/commands/unpack_command.rb
@@ -3,6 +3,7 @@ require 'rubygems/command'
 require 'rubygems/version_option'
 require 'rubygems/security_option'
 require 'rubygems/remote_fetcher'
+require 'rubygems/package'
 
 # forward-declare
 
diff --git a/lib/rubygems/source/local.rb b/lib/rubygems/source/local.rb
index 875e992d85..f68715cdf0 100644
--- a/lib/rubygems/source/local.rb
+++ b/lib/rubygems/source/local.rb
@@ -3,6 +3,8 @@
 # The local source finds gems in the current directory for fulfilling
 # dependencies.
 
+require 'rubygems/package'
+
 class Gem::Source::Local < Gem::Source
 
   def initialize # :nodoc:
diff --git a/lib/rubygems/source/specific_file.rb b/lib/rubygems/source/specific_file.rb
index a22772b9c0..0905f6d0e9 100644
--- a/lib/rubygems/source/specific_file.rb
+++ b/lib/rubygems/source/specific_file.rb
@@ -3,6 +3,8 @@
 # A source representing a single .gem file.  This is used for installation of
 # local gems.
 
+require 'rubygems/package'
+
 class Gem::Source::SpecificFile < Gem::Source
 
   ##