diff --git a/includes/bootstrap.inc b/includes/bootstrap.inc
index 9cf7325a93..9e06f431e7 100644
--- a/includes/bootstrap.inc
+++ b/includes/bootstrap.inc
@@ -101,3 +101,30 @@ define('DRUSH_BOOTSTRAP_DRUPAL_FULL', 5);
  * be different based on who is logged in.
  */
 define('DRUSH_BOOTSTRAP_DRUPAL_LOGIN', 6);
+
+/**
+ * Used by a Drush extension to request that its Composer autoload
+ * files be loaded by Drush, if they have not already been.
+ *
+ * Usage:
+ *
+ * function myextension_init() {
+ *   drush_autoload(__FILE__)
+ * }
+ */
+function drush_autoload($commandfile) {
+	$already_added = commandfiles_cache()->add($commandfile);
+
+	if (!$already_added) {
+		$dir = dirname($commandfile);
+		$candidates = array("vendor/autoload.php", "../../../vendor/autoload.php");
+		$drush_autoload_file = drush_get_context('DRUSH_VENDOR_PATH', '');
+
+		foreach ($candidates as $candidate) {
+		    $autoload = $dir . '/' . $candidate;
+		    if (file_exists($autoload) && (realpath($autoload) != $drush_autoload_file)) {
+		    	include $autoload;
+		    }
+		}
+	}
+}
diff --git a/includes/command.inc b/includes/command.inc
index b05219c847..dd49a69f2a 100644
--- a/includes/command.inc
+++ b/includes/command.inc
@@ -1365,7 +1365,7 @@ function drush_command_normalize_name($command_name) {
  *   command files.
  */
 function drush_commandfile_list() {
-  return Drush\Drush::commandfiles_cache()->get();
+  return commandfiles_cache()->get();
 }
 
 function _drush_add_commandfiles($searchpath, $phase = NULL, $reset = FALSE) {
@@ -1392,7 +1392,7 @@ function _drush_add_commandfiles($searchpath, $phase = NULL, $reset = FALSE) {
 
     // Build a list of all of the modules to attempt to load.
     // Start with any modules deferred from a previous phase.
-    $list = Drush\Drush::commandfiles_cache()->deferred();
+    $list = commandfiles_cache()->deferred();
     if (isset($cached_list)) {
       $list = array_merge($list, $cached_list);
     }
@@ -1425,7 +1425,7 @@ function _drush_add_commandfiles($searchpath, $phase = NULL, $reset = FALSE) {
       // command file cache may not be available anymore, in which case
       // we rebuild the cache for this phase.
       if ($filepath = realpath($filename)) {
-        $load_command = Drush\Drush::commandfiles_cache()->add($filepath);
+        $load_command = commandfiles_cache()->add($filepath);
         if ($load_command) {
           $needs_sort = TRUE;
         }
@@ -1437,7 +1437,7 @@ function _drush_add_commandfiles($searchpath, $phase = NULL, $reset = FALSE) {
     }
 
     if ($needs_sort) {
-      Drush\Drush::commandfiles_cache()->sort();
+      commandfiles_cache()->sort();
     }
   }
 }
@@ -1772,3 +1772,12 @@ function drush_shell_alias_replace() {
     _drush_preflight_global_options();
   }
 }
+
+function commandfiles_cache() {
+  static $commandfiles_cache = NULL;
+
+  if (!isset($commandfiles_cache)) {
+    $commandfiles_cache = new Drush\Command\Commandfiles();
+  }
+  return $commandfiles_cache;
+}
diff --git a/lib/Drush/Boot/command.inc b/lib/Drush/Boot/command.inc
index fc7b5a63ab..c36a9cf6ae 100644
--- a/lib/Drush/Boot/command.inc
+++ b/lib/Drush/Boot/command.inc
@@ -135,7 +135,7 @@ function drush_command_belongs_to_disabled_module() {
       }
       else {
         // The command does not define Drupal dependencies. Derive them.
-        $command_files = Drush\Drush::commandfiles_cache()->get();
+        $command_files = commandfiles_cache()->get();
         $command_path = $commands[$command_name]['path'] . DIRECTORY_SEPARATOR . $commands[$command_name]['commandfile'] . '.drush.inc';
         $modules = array_search($command_path, $command_files);
       }
diff --git a/lib/Drush/Drush.php b/lib/Drush/Drush.php
deleted file mode 100644
index 130da33d85..0000000000
--- a/lib/Drush/Drush.php
+++ /dev/null
@@ -1,63 +0,0 @@
-<?php
-
-/**
- * @file
- * Definition of Drush\Drush.
- */
-
-namespace Drush;
-
-/**
- * The Drush API.
- */
-class Drush {
-	static $commandfiles_cache;
-	
-	/**
-	 * Run a drush command in a new process
-	 */
-	static function drush($site, $command_name, $commandline_args = array(), $commandline_options = array(), $backend_options = TRUE) {
-		return drush_invoke_process($site, $command_name, $commandline_args, $commandline_options, $backend_options);
-	}
-
-	/**
-	 * Run a drush subcommand in the same process, with the same options as the primary command.
-	 */
-	static function invoke($command, $arguments = array()) {
-		return drush_invoke($command, $arguments);
-	}
-
-	/**
-	 * Register a Drush extension commandfile, and load its autoload
-	 * file, if necessary.
-	 */
-	static function autoload($commandfile) {
-		$already_added = self::commandfiles_cache()->add($commandfile);
-
-		if (!$already_added) {
-			$dir = dirname($commandfile);
-			$candidates = array("vendor/autoload.php", "../../../vendor/autoload.php");
-			$drush_autoload_file = drush_get_context('DRUSH_VENDOR_PATH', '');
-
-			foreach ($candidates as $candidate) {
-			    $autoload = $dir . '/' . $candidate;
-			    if (file_exists($autoload) && (realpath($autoload) != $drush_autoload_file)) {
-			    	include $autoload;
-			    }
-			}
-		}
-	}
-
-	// ====== Things used internally by Drush ======
-
-	static function set_commandfiles_cache($commandfiles_cache) {
-		self::$commandfiles_cache = $commandfiles_cache;
-	}
-	
-	static function commandfiles_cache() {
-		if (!isset(self::$commandfiles_cache)) {
-			self::$commandfiles_cache = new Command\Commandfiles();
-		}
-		return self::$commandfiles_cache;
-	}
-}