diff --git a/lib/execjs.rb b/lib/execjs.rb
index 688f04b..f41e0e2 100644
--- a/lib/execjs.rb
+++ b/lib/execjs.rb
@@ -15,6 +15,6 @@ def self.eval(source)
   end
 
   def self.runtime
-    @runtime ||= Runtimes::Node.new
+    @runtime ||= Runtimes.runtime
   end
 end
diff --git a/lib/execjs/runtimes.rb b/lib/execjs/runtimes.rb
index aaa1ecc..30aa486 100644
--- a/lib/execjs/runtimes.rb
+++ b/lib/execjs/runtimes.rb
@@ -1,5 +1,10 @@
 module ExecJS
   module Runtimes
     autoload :Node, "execjs/runtimes/node"
+    autoload :V8,   "execjs/runtimes/v8"
+
+    def self.runtime
+      V8.new
+    end
   end
 end
diff --git a/lib/execjs/runtimes/v8.js b/lib/execjs/runtimes/v8.js
new file mode 100644
index 0000000..f7fbedb
--- /dev/null
+++ b/lib/execjs/runtimes/v8.js
@@ -0,0 +1,18 @@
+(function(program, execJS) { execJS(program) })(function() { #{source}
+}, function(program) {
+  var output;
+  try {
+    result = program();
+    if (typeof result == 'undefined' && result !== null) {
+      print('["ok"]');
+    } else {
+      try {
+        print(JSON.stringify(['ok', result]));
+      } catch (err) {
+        print('["err"]');
+      }
+    }
+  } catch (err) {
+    print(JSON.stringify(['err', '' + err]));
+  }
+});
diff --git a/lib/execjs/runtimes/v8.rb b/lib/execjs/runtimes/v8.rb
new file mode 100644
index 0000000..aec0030
--- /dev/null
+++ b/lib/execjs/runtimes/v8.rb
@@ -0,0 +1,13 @@
+module ExecJS
+  module Runtimes
+    class V8 < Runtime
+      def command(filename)
+        "v8 #{filename}"
+      end
+
+      def runner_path
+        File.expand_path('../v8.js', __FILE__)
+      end
+    end
+  end
+end
diff --git a/readme.md b/readme.md
index 4bffb5e..01f6154 100644
--- a/readme.md
+++ b/readme.md
@@ -9,8 +9,8 @@ ExecJS supports these runtimes:
 
 * [therubyracer](https://github.com/cowboyd/therubyracer) - Google V8
   embedded within Ruby for exceptional performance
-* [Node.js](http://nodejs.org/)
 * [Google V8](http://code.google.com/p/v8/)
+* [Node.js](http://nodejs.org/)
 * Apple JavaScriptCore
 * [Mozilla Spidermonkey](http://www.mozilla.org/js/spidermonkey/)
 * [Mozilla Rhino](http://www.mozilla.org/rhino/)
diff --git a/test/test_node_runtime.rb b/test/test_runtime.rb
similarity index 87%
rename from test/test_node_runtime.rb
rename to test/test_runtime.rb
index e4fbd4e..ef028e6 100644
--- a/test/test_node_runtime.rb
+++ b/test/test_runtime.rb
@@ -1,11 +1,7 @@
 require "execjs"
 require "test/unit"
 
-class TestNodeRuntime < Test::Unit::TestCase
-  def setup
-    @runtime = ExecJS::Runtimes::Node.new
-  end
-
+module TestRuntime
   def test_exec
     assert_nil @runtime.exec("1")
     assert_nil @runtime.exec("return")
@@ -42,3 +38,19 @@ def test_thrown_exception
     end
   end
 end
+
+class TestNodeRuntime < Test::Unit::TestCase
+  include TestRuntime
+
+  def setup
+    @runtime = ExecJS::Runtimes::Node.new
+  end
+end
+
+class TestV8Runtime < Test::Unit::TestCase
+  include TestRuntime
+
+  def setup
+    @runtime = ExecJS::Runtimes::V8.new
+  end
+end