diff --git a/src/generic/SendReliabilityLayer.php b/src/generic/SendReliabilityLayer.php
index b519ff6..e0e75ae 100644
--- a/src/generic/SendReliabilityLayer.php
+++ b/src/generic/SendReliabilityLayer.php
@@ -124,7 +124,7 @@ public function sendQueue() : void{
 	}
 
 	private function addToQueue(EncapsulatedPacket $pk, bool $immediate) : void{
-		if(PacketReliability::isReliable($pk->reliability)){
+		if($pk->reliability->isReliable()){
 			if($pk->messageIndex === null || $pk->messageIndex < $this->reliableWindowStart){
 				throw new \InvalidArgumentException("Cannot send a reliable packet with message index less than the window start ($pk->messageIndex < $this->reliableWindowStart)");
 			}