diff --git a/src/block/Block.php b/src/block/Block.php
index 4b82a0cb9..d54f6ef2b 100644
--- a/src/block/Block.php
+++ b/src/block/Block.php
@@ -585,7 +585,7 @@ class Block{
 	public function isFullCube() : bool{
 		$bb = $this->getCollisionBoxes();
 
-		return count($bb) === 1 and $bb[0]->getAverageEdgeLength() >= 1; //TODO: average length 1 != cube
+		return count($bb) === 1 and $bb[0]->getAverageEdgeLength() >= 1 and $bb[0]->isCube();
 	}
 
 	public function calculateIntercept(Vector3 $pos1, Vector3 $pos2) : ?RayTraceResult{