diff --git a/src/build/compile.sh b/src/build/compile.sh
index 13b9d2514..f2d6e04e2 100755
--- a/src/build/compile.sh
+++ b/src/build/compile.sh
@@ -11,7 +11,7 @@ PHPNCURSES_VERSION="1.0.2"
 PTHREADS_VERSION="2.0.4"
 PHP_POCKETMINE_VERSION="0.0.4"
 UOPZ_VERSION="2.0.3"
-WEAKREF_VERSION="0.2.2"
+WEAKREF_VERSION="0.2.4"
 PHPYAML_VERSION="1.1.1"
 YAML_VERSION="0.1.4"
 LIBXML_VERSION="2.9.1"
@@ -527,11 +527,11 @@ fi
 #mv uopz-$UOPZ_VERSION "$DIR/install_data/php/ext/uopz"
 #echo " done!"
 
-#WeakRef
-#echo -n "[PHP WeakRef] downloading $WEAKREF_VERSION..."
-#download_file "http://pecl.php.net/get/Weakref-$WEAKREF_VERSION.tgz" | tar -zx >> "$DIR/install.log" 2>&1
-#mv Weakref-$WEAKREF_VERSION "$DIR/install_data/php/ext/weakref"
-#echo " done!"
+WeakRef
+echo -n "[PHP Weakref] downloading $WEAKREF_VERSION..."
+download_file "http://pecl.php.net/get/Weakref-$WEAKREF_VERSION.tgz" | tar -zx >> "$DIR/install.log" 2>&1
+mv Weakref-$WEAKREF_VERSION "$DIR/install_data/php/ext/weakref"
+echo " done!"
 
 #PHP YAML
 echo -n "[PHP YAML] downloading $PHPYAML_VERSION..."
diff --git a/src/pocketmine/PocketMine.php b/src/pocketmine/PocketMine.php
index e8d0d80e2..10cd3b4ef 100644
--- a/src/pocketmine/PocketMine.php
+++ b/src/pocketmine/PocketMine.php
@@ -333,11 +333,16 @@ namespace pocketmine {
 			console("[ERROR] You have the native PocketMine extension, but your version is lower than 0.0.1.", true, true, 0);
 			++$errors;
 		}elseif(version_compare(phpversion("pocketmine"), "0.0.4") > 0){
-			console("[ERROR] You have the native PocketMine extension, but your version is lower than 0.0.4.", true, true, 0);
+			console("[ERROR] You have the native PocketMine extension, but your version is higher than 0.0.4.", true, true, 0);
 			++$errors;
 		}
 	}
 
+	if(!extension_loaded("Weakref") and !extension_loaded("weakref")){
+		console("[ERROR] Unable to find the Weakref extension.", true, true, 0);
+		++$errors;
+	}
+
 	if(!extension_loaded("curl")){
 		console("[ERROR] Unable to find the cURL extension.", true, true, 0);
 		++$errors;
diff --git a/src/stubs/weakref.php b/src/stubs/weakref.php
new file mode 100644
index 000000000..b53b50abd
--- /dev/null
+++ b/src/stubs/weakref.php
@@ -0,0 +1,127 @@
+<?php
+/**
+ * WeakRef extension stub file for code completion purposes
+ *
+ * WARNING: Do not include this file
+ *
+ */
+
+class WeakRef{
+
+	/**
+	 * Constructs a new weak reference.
+	 *
+	 * @param object $object
+	 */
+	public function __construct($object = null){}
+
+	/**
+	 * Acquires a strong reference on that object,
+	 * virtually turning the weak reference into a strong one.
+	 *
+	 * @return bool
+	 */
+	public function acquire(){}
+
+	/**
+	 * Returns the object pointed to by the weak reference
+	 *
+	 * @return object
+	 */
+	public function get(){}
+
+	/**
+	 * Releases a previously acquired reference,
+	 * potentially turning a strong reference back into a weak reference.
+	 *
+	 * @return bool
+	 */
+	public function release(){}
+
+	/**
+	 * Checks whether the object referenced still exists
+	 *
+	 * @return bool
+	 */
+	public function valid(){}
+}
+
+class WeakMap implements Countable, ArrayAccess, Iterator{
+
+	/**
+	 * Constructs a new map
+	 */
+	public function __construct(){}
+
+	/**
+	 * Counts the number of live entries in the map
+	 *
+	 * @return int
+	 */
+	public function count(){}
+
+	/**
+	 * Returns the current value being iterated on in the map.
+	 *
+	 * @return mixed
+	 */
+	public function current(){}
+
+	/**
+	 * Returns the object serving as key in the map, at the current iterating position.
+	 *
+	 * @return mixed
+	 */
+	public function key(){}
+
+	/**
+	 * Advances to the next map element.
+	 */
+	public function next(){}
+
+	/**
+	 * Checks whether the passed object is referenced in the map.
+	 *
+	 * @param object $object
+	 *
+	 * @return bool
+	 */
+	public function offsetExists($object){}
+
+	/**
+	 * Returns the value pointed to by a certain object.
+	 *
+	 * @param object $object
+	 *
+	 * @return mixed
+	 */
+	public function offsetGet($object){}
+
+	/**
+	 * Updates the map with a new key-value pair.
+	 * If the key already existed in the map, the old value is replaced with the new.
+	 *
+	 * @param object $object
+	 * @param mixed $value
+	 */
+	public function offsetSet($object, $value){}
+
+	/**
+	 * Removes an entry from the map.
+	 *
+	 * @param object $object
+	 */
+	public function offsetUnset($object){}
+
+	/**
+	 * Rewinds the iterator to the beginning of the map.
+	 */
+	public function rewind(){}
+
+	/**
+	 * Returns whether the iterator is still on a valid map element.
+	 *
+	 * @return bool
+	 */
+	public function valid(){}
+}
\ No newline at end of file