diff --git a/src/pocketmine/entity/Living.php b/src/pocketmine/entity/Living.php
index cb8facf45..4e7a74bf9 100644
--- a/src/pocketmine/entity/Living.php
+++ b/src/pocketmine/entity/Living.php
@@ -101,7 +101,7 @@ public function attack($damage, $source = EntityDamageEvent::CAUSE_MAGIC){
 			$deltaX = $this->x - $e->x;
 			$deltaZ = $this->z - $e->z;
 			$yaw = atan2($deltaX, $deltaZ);
-			$this->knockBack($e, $damage, sin($yaw), cos($yaw));
+			$this->knockBack($e, $damage, sin($yaw), cos($yaw), $source->getKnockBack());
 		}
 
 		$this->setHealth($this->getHealth() - $damage);
@@ -114,9 +114,8 @@ public function attack($damage, $source = EntityDamageEvent::CAUSE_MAGIC){
 		$this->attackTime = 10; //0.5 seconds cooldown
 	}
 
-	public function knockBack(Entity $attacker, $damage, $x, $z){
+	public function knockBack(Entity $attacker, $damage, $x, $z, $base = 0.4){
 		$f = sqrt($x ** 2 + $z ** 2);
-		$base = 0.4;
 
 		$motion = new Vector3($this->motionX, $this->motionY, $this->motionZ);
 
diff --git a/src/pocketmine/event/entity/EntityDamageByEntityEvent.php b/src/pocketmine/event/entity/EntityDamageByEntityEvent.php
index aa0c757d1..6037acc4c 100644
--- a/src/pocketmine/event/entity/EntityDamageByEntityEvent.php
+++ b/src/pocketmine/event/entity/EntityDamageByEntityEvent.php
@@ -29,16 +29,19 @@ class EntityDamageByEntityEvent extends EntityDamageEvent{
 
 	/** @var Entity */
 	private $damager;
-
+	/** @var float */
+	private $knockBack;
 
 	/**
 	 * @param Entity    $damager
 	 * @param Entity    $entity
 	 * @param int       $cause
 	 * @param int|int[] $damage
+	 * @param float     $knockBack
 	 */
-	public function __construct(Entity $damager, Entity $entity, $cause, $damage){
+	public function __construct(Entity $damager, Entity $entity, $cause, $damage, $knockBack = 0.4){
 		$this->damager = $damager;
+		$this->knockBack = $knockBack;
 		parent::__construct($entity, $cause, $damage);
 	}
 
@@ -48,6 +51,16 @@ public function __construct(Entity $damager, Entity $entity, $cause, $damage){
 	public function getDamager(){
 		return $this->damager;
 	}
-
-
-}
\ No newline at end of file
+	/**
+	 * @return float
+	 */
+	public function getKnockBack(){
+		return $this->knockBack;
+	}
+	/**
+	 * @param float $knockBack
+	 */
+	public function setKnockBack($knockBack){
+		$this->knockBack = $knockBack;
+	}
+}