diff --git a/Puc/v4/Autoloader.php b/Puc/v4/Autoloader.php
index 8376537..7e90fa5 100644
--- a/Puc/v4/Autoloader.php
+++ b/Puc/v4/Autoloader.php
@@ -1,45 +1,49 @@
 <?php
 
-class Puc_v4_Autoloader {
-	private $prefix = '';
-	private $rootDir = '';
-	private $libraryDir = '';
+if ( !class_exists('Puc_v4_Autoloader', false) ):
 
-	private $staticMap;
+	class Puc_v4_Autoloader {
+		private $prefix = '';
+		private $rootDir = '';
+		private $libraryDir = '';
 
-	public function __construct() {
-		$this->rootDir = dirname(__FILE__) . '/';
-		$nameParts = explode('_', __CLASS__, 3);
-		$this->prefix = $nameParts[0] . '_' . $nameParts[1] . '_';
+		private $staticMap;
 
-		$this->libraryDir = realpath($this->rootDir . '../..') . '/';
-		$this->staticMap = array(
-			'PucReadmeParser' => 'vendor/readme-parser.php',
-			'Parsedown' => 'vendor/ParsedownLegacy.php',
-		);
-		if ( version_compare(PHP_VERSION, '5.3.0', '>=') ) {
-			$this->staticMap['Parsedown'] = 'vendor/Parsedown.php';
+		public function __construct() {
+			$this->rootDir = dirname(__FILE__) . '/';
+			$nameParts = explode('_', __CLASS__, 3);
+			$this->prefix = $nameParts[0] . '_' . $nameParts[1] . '_';
+
+			$this->libraryDir = realpath($this->rootDir . '../..') . '/';
+			$this->staticMap = array(
+				'PucReadmeParser' => 'vendor/readme-parser.php',
+				'Parsedown' => 'vendor/ParsedownLegacy.php',
+			);
+			if ( version_compare(PHP_VERSION, '5.3.0', '>=') ) {
+				$this->staticMap['Parsedown'] = 'vendor/Parsedown.php';
+			}
+
+			spl_autoload_register(array($this, 'autoload'));
 		}
 
-		spl_autoload_register(array($this, 'autoload'));
-	}
-
-	public function autoload($className) {
-		if ( isset($this->staticMap[$className]) && file_exists($this->libraryDir . $this->staticMap[$className]) ) {
-			/** @noinspection PhpIncludeInspection */
-			include ($this->libraryDir . $this->staticMap[$className]);
-			return;
-		}
-
-		if (strpos($className, $this->prefix) === 0) {
-			$path = substr($className, strlen($this->prefix));
-			$path = str_replace('_', '/', $path);
-			$path = $this->rootDir . $path . '.php';
-
-			if (file_exists($path)) {
+		public function autoload($className) {
+			if ( isset($this->staticMap[$className]) && file_exists($this->libraryDir . $this->staticMap[$className]) ) {
 				/** @noinspection PhpIncludeInspection */
-				include $path;
+				include ($this->libraryDir . $this->staticMap[$className]);
+				return;
+			}
+
+			if (strpos($className, $this->prefix) === 0) {
+				$path = substr($className, strlen($this->prefix));
+				$path = str_replace('_', '/', $path);
+				$path = $this->rootDir . $path . '.php';
+
+				if (file_exists($path)) {
+					/** @noinspection PhpIncludeInspection */
+					include $path;
+				}
 			}
 		}
 	}
-}
\ No newline at end of file
+
+endif;
\ No newline at end of file
diff --git a/plugin-update-checker.php b/plugin-update-checker.php
index 8aff3eb..05837cc 100644
--- a/plugin-update-checker.php
+++ b/plugin-update-checker.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * Plugin Update Checker Library 4.0
+ * Plugin Update Checker Library 4.0.2
  * http://w-shadow.com/
  * 
  * Copyright 2017 Janis Elsts