diff --git a/rhino_modules/os.js b/rhino_modules/os.js
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--- /dev/null
+++ b/rhino_modules/os.js
@@ -0,0 +1,8 @@
+/**
+ * Partial Rhino implementation of Node.js' `os` module.
+ * @module os
+ * @author Jeff Williams <jeffrey.l.williams@gmail.com>
+ * @see http://nodejs.org/api/os.html
+ */
+
+exports.EOL = java.lang.System.getProperty('line.separator') + '';