diff --git a/src/Ad5001/BetterGen/populator/MineshaftPopulator.php b/src/Ad5001/BetterGen/populator/MineshaftPopulator.php
index e2109c8..7e5c7f9 100644
--- a/src/Ad5001/BetterGen/populator/MineshaftPopulator.php
+++ b/src/Ad5001/BetterGen/populator/MineshaftPopulator.php
@@ -87,7 +87,7 @@ class MineshaftPopulator extends AmountPopulator {
 	 * @param Random $random
 	 */
 	public function generateMineshaftPart(int $x, int $y, int $z, int $dir, Random $random) {
-		if ($this->maxPath -- < 1 || $y >= $this->getHighestBlockAt($x, $z) - 10)
+		if ($this->maxPath -- < 1 || $y >= $this->getHighestWorkableBlock($x, $z) - 10)
 			return;
 		$type = $random->nextBoundedInt(3);
 		$level = $this->level;