diff --git a/src/pocketmine/block/CobblestoneWall.php b/src/pocketmine/block/CobblestoneWall.php
index 3d8c7bdc0..050c469b3 100644
--- a/src/pocketmine/block/CobblestoneWall.php
+++ b/src/pocketmine/block/CobblestoneWall.php
@@ -27,7 +27,7 @@ use pocketmine\item\Tool;
 use pocketmine\math\AxisAlignedBB;
 use pocketmine\math\Vector3;
 
-class CobblestoneWall extends Fence{
+class CobblestoneWall extends Transparent{
 	const NONE_MOSSY_WALL = 0;
 	const MOSSY_WALL = 1;
 
@@ -53,8 +53,38 @@ class CobblestoneWall extends Fence{
 		return "Cobblestone Wall";
 	}
 
-	public function getThickness() : float{
-		return 0.5;
+	protected function recalculateBoundingBox() : ?AxisAlignedBB{
+		//walls don't have any special collision boxes like fences do
+
+		$north = $this->canConnect($this->getSide(Vector3::SIDE_NORTH));
+		$south = $this->canConnect($this->getSide(Vector3::SIDE_SOUTH));
+		$west = $this->canConnect($this->getSide(Vector3::SIDE_WEST));
+		$east = $this->canConnect($this->getSide(Vector3::SIDE_EAST));
+
+		$inset = 0.25;
+		if(
+			$this->getSide(Vector3::SIDE_UP)->getId() === Block::AIR and //if there is a block on top, it stays as a post
+			(
+				($north and $south and !$west and !$east) or
+				(!$north and !$south and $west and $east)
+			)
+		){
+			//If connected to two sides on the same axis but not any others, AND there is not a block on top, there is no post and the wall is thinner
+			$inset = 0.3125;
+		}
+
+		return new AxisAlignedBB(
+			$this->x + ($west ? 0 : $inset),
+			$this->y,
+			$this->z + ($north ? 0 : $inset),
+			$this->x + 1 - ($east ? 0 : $inset),
+			$this->y + 1.5,
+			$this->z + 1 - ($south ? 0 : $inset)
+		);
+	}
+
+	public function canConnect(Block $block){
+		return $block instanceof static or $block instanceof FenceGate or ($block->isSolid() and !$block->isTransparent());
 	}
 
 }