diff --git a/src/pocketmine/entity/Living.php b/src/pocketmine/entity/Living.php
index f7255d1f2..6df27765f 100644
--- a/src/pocketmine/entity/Living.php
+++ b/src/pocketmine/entity/Living.php
@@ -550,7 +550,7 @@ abstract class Living extends Entity implements Damageable{
 	 * @param int $ticks
 	 */
 	public function setMaxAirSupplyTicks(int $ticks){
-		$this->setDataProperty(self::DATA_AIR, self::DATA_TYPE_SHORT, $ticks);
+		$this->setDataProperty(self::DATA_MAX_AIR, self::DATA_TYPE_SHORT, $ticks);
 	}
 
 	/**