diff --git a/features/appraisals.feature b/features/appraisals.feature
index 57c6739e..aa9d4332 100644
--- a/features/appraisals.feature
+++ b/features/appraisals.feature
@@ -13,7 +13,6 @@ Feature: run a rake task through several appraisals
     When I cd to "projecto"
     And I write to "Gemfile" with:
     """
-    source "http://rubygems.org"
     gem "dummy_rake", "0.8.7"
     gem "dummy_girl"
     group :assets do
diff --git a/features/gemspec.feature b/features/gemspec.feature
index 71ca0c53..21a10daa 100644
--- a/features/gemspec.feature
+++ b/features/gemspec.feature
@@ -49,7 +49,6 @@ Feature: appraisals using an existing gemspec
   Scenario: run a gem in the gemspec
     And I write to "Gemfile" with:
     """
-    source "http://rubygems.org"
     gemspec
     """
     When I add "appraisal" from this project as a dependency
@@ -62,7 +61,6 @@ Feature: appraisals using an existing gemspec
   Scenario: run a gem in the gemspec via path
     And I write to "Gemfile" with:
     """
-    source "http://rubygems.org"
     gemspec :path => './specdir'
     """
     When I add "appraisal" from this project as a dependency
diff --git a/features/step_definitions/dependency_steps.rb b/features/step_definitions/dependency_steps.rb
index 021cdf45..382fa5c7 100644
--- a/features/step_definitions/dependency_steps.rb
+++ b/features/step_definitions/dependency_steps.rb
@@ -22,9 +22,9 @@
     SPEC
     write_file(gem_path, spec)
     write_file(version_path, "$#{name}_version = '#{version}'")
-    run_simple("gem build #{gem_path}")
+    in_current_dir { `gem build #{gem_path} 2>&1` }
     set_env("GEM_HOME", TMP_GEM_ROOT)
-    run_simple("gem install #{name}-#{version}.gem")
+    in_current_dir { `gem install #{name}-#{version}.gem 2>&1` }
     FileUtils.rm_rf(File.join(current_dir, name))
     dirs.pop
   end
diff --git a/lib/appraisal/gemfile.rb b/lib/appraisal/gemfile.rb
index da15749d..126593c0 100644
--- a/lib/appraisal/gemfile.rb
+++ b/lib/appraisal/gemfile.rb
@@ -7,6 +7,7 @@ class Gemfile
     attr_reader :dependencies
 
     def initialize
+      @sources = []
       @dependencies = {}
     end
 
@@ -27,7 +28,7 @@ def group(name)
     end
 
     def source(source)
-      @source = source
+      @sources << source
     end
 
     def to_s
@@ -36,7 +37,7 @@ def to_s
 
     def dup
       gemfile = Gemfile.new
-      gemfile.source @source
+      @sources.each { |source| gemfile.source source }
       dependencies.values.each do |dependency|
         gemfile.gem(dependency.name, *dependency.requirements)
       end
@@ -51,7 +52,7 @@ def gemspec(options = {})
     protected
 
     def source_entry
-      %(source "#{@source}")
+      @sources.map { |source| %(source "#{source}") }.join("\n")
     end
 
     def dependencies_entry
diff --git a/spec/appraisal/gemfile_spec.rb b/spec/appraisal/gemfile_spec.rb
new file mode 100644
index 00000000..69c2189a
--- /dev/null
+++ b/spec/appraisal/gemfile_spec.rb
@@ -0,0 +1,16 @@
+require 'spec_helper'
+require 'appraisal/gemfile'
+
+describe Appraisal::Gemfile do
+  it "supports gemfiles without sources" do
+    gemfile = Appraisal::Gemfile.new
+    gemfile.to_s.strip.should == ""
+  end
+
+  it "supports multiple sources" do
+    gemfile = Appraisal::Gemfile.new
+    gemfile.source "one"
+    gemfile.source "two"
+    gemfile.to_s.strip.should == %{source "one"\nsource "two"}
+  end
+end