diff --git a/src/pocketmine/block/StillLava.php b/src/pocketmine/block/StillLava.php
index c273860d4..4a694f195 100644
--- a/src/pocketmine/block/StillLava.php
+++ b/src/pocketmine/block/StillLava.php
@@ -21,10 +21,19 @@
 
 namespace pocketmine\block;
 
+use pocketmine\level\Level;
+
 class StillLava extends Lava{
 
 	protected $id = self::STILL_LAVA;
 
+	public function onUpdate($type){
+		if($type !== Level::BLOCK_UPDATE_SCHEDULED){
+			return parent::onUpdate($type);
+		}
+		return false;
+	}
+
 	public function getName(){
 		return "Still Lava";
 	}
diff --git a/src/pocketmine/block/StillWater.php b/src/pocketmine/block/StillWater.php
index 8c67f65a3..3e308ed90 100644
--- a/src/pocketmine/block/StillWater.php
+++ b/src/pocketmine/block/StillWater.php
@@ -21,10 +21,19 @@
 
 namespace pocketmine\block;
 
+use pocketmine\level\Level;
+
 class StillWater extends Water{
 
 	protected $id = self::STILL_WATER;
 
+	public function onUpdate($type){
+		if($type !== Level::BLOCK_UPDATE_SCHEDULED){
+			return parent::onUpdate($type);
+		}
+		return false;
+	}
+
 	public function getName(){
 		return "Still Water";
 	}