diff --git a/lib/jasmine/headless/options.rb b/lib/jasmine/headless/options.rb
index a6a9f90..e3d324b 100644
--- a/lib/jasmine/headless/options.rb
+++ b/lib/jasmine/headless/options.rb
@@ -27,7 +27,8 @@ module Jasmine
       end
 
       def initialize(opts = {})
-        @options = DEFAULT_OPTIONS.dup.merge(opts)
+        @options = DEFAULT_OPTIONS.dup
+        opts.each { |k, v| @options[k] = v if v }
       end
 
       def process_option(*args)
diff --git a/lib/jasmine/headless/task.rb b/lib/jasmine/headless/task.rb
index 97a5b6b..ed3dfdf 100644
--- a/lib/jasmine/headless/task.rb
+++ b/lib/jasmine/headless/task.rb
@@ -1,3 +1,5 @@
+require 'jasmine/headless/runner'
+
 module Jasmine
   module Headless
     class Task
@@ -18,7 +20,11 @@ module Jasmine
 
         desc 'Run Jasmine specs headlessly'
         task name do
-          system %{jasmine-headless-webkit #{@colors ? "-c" : "--no-colors"} #{@keep_on_error ? "--keep" : ""} #{@jasmine_config ? "-j #{@jasmine_config}" : ""}}
+          Jasmine::Headless::Runner.run(
+            :colors => colors, 
+            :remove_html_file => !@keep_on_error, 
+            :jasmine_config => @jasmine_config
+          )
         end
       end
     end
diff --git a/spec/lib/jasmine/headless/options_spec.rb b/spec/lib/jasmine/headless/options_spec.rb
index f85b873..64f0173 100644
--- a/spec/lib/jasmine/headless/options_spec.rb
+++ b/spec/lib/jasmine/headless/options_spec.rb
@@ -7,9 +7,11 @@ describe Jasmine::Headless::Options do
   let(:opts) { {} }
 
   describe '#initialize' do
+    let(:default_config) {  'spec/javascripts/support/jasmine.yml' }
+
     context 'empty' do
       it "should have default options" do
-        options[:jasmine_config].should == 'spec/javascripts/support/jasmine.yml'
+        options[:jasmine_config].should == default_config
       end
     end
     
@@ -20,6 +22,14 @@ describe Jasmine::Headless::Options do
         options[:jasmine_config].should == 'test'
       end
     end
+    
+    context 'with nil provided' do
+      let(:opts) { { :jasmine_config => nil } }
+
+      it 'should override an option' do
+        options[:jasmine_config].should == default_config
+      end
+    end
   end
 
   describe '#process_option' do
diff --git a/spec/lib/jasmine/headless/runner_spec.rb b/spec/lib/jasmine/headless/runner_spec.rb
index 3b248e5..bed7f8c 100644
--- a/spec/lib/jasmine/headless/runner_spec.rb
+++ b/spec/lib/jasmine/headless/runner_spec.rb
@@ -7,7 +7,7 @@ describe Jasmine::Headless::Runner do
   let(:options) { Jasmine::Headless::Options.new(opts) }
 
   describe '#initialize' do
-    let(:opts) { { :test => 'test' } }
+    let(:opts) { { :test => 'test', :jasmine_config => nil } }
 
     it 'should have default options' do
       runner.options[:test].should == 'test'