diff --git a/src/main/java/de/bixilon/minosoft/data/registries/shapes/voxel/AbstractVoxelShape.kt b/src/main/java/de/bixilon/minosoft/data/registries/shapes/voxel/AbstractVoxelShape.kt
index d35de7dbc..e486484e4 100644
--- a/src/main/java/de/bixilon/minosoft/data/registries/shapes/voxel/AbstractVoxelShape.kt
+++ b/src/main/java/de/bixilon/minosoft/data/registries/shapes/voxel/AbstractVoxelShape.kt
@@ -41,7 +41,7 @@ abstract class AbstractVoxelShape : Iterable<AABB> {
     }
 
     private inline fun modify(modify: (AABB) -> AABB): AbstractVoxelShape {
-        val result: MutableSet<AABB> = ObjectOpenHashSet()
+        val result: MutableList<AABB> = ArrayList()
         for (aabb in this) {
             result += modify(aabb)
         }
diff --git a/src/main/java/de/bixilon/minosoft/data/registries/shapes/voxel/VoxelShape.kt b/src/main/java/de/bixilon/minosoft/data/registries/shapes/voxel/VoxelShape.kt
index 8ebd89fb4..5766e0c96 100644
--- a/src/main/java/de/bixilon/minosoft/data/registries/shapes/voxel/VoxelShape.kt
+++ b/src/main/java/de/bixilon/minosoft/data/registries/shapes/voxel/VoxelShape.kt
@@ -18,7 +18,7 @@ import de.bixilon.minosoft.data.registries.shapes.aabb.AABB
 import it.unimi.dsi.fastutil.objects.ObjectOpenHashSet
 
 class VoxelShape(
-    val aabb: Set<AABB>,
+    val aabb: Collection<AABB>,
 ) : AbstractVoxelShape() {
     override val aabbs: Int = aabb.size
 
diff --git a/src/main/java/de/bixilon/minosoft/physics/parts/CollisionMovementPhysics.kt b/src/main/java/de/bixilon/minosoft/physics/parts/CollisionMovementPhysics.kt
index 970d52d23..08fec5f33 100644
--- a/src/main/java/de/bixilon/minosoft/physics/parts/CollisionMovementPhysics.kt
+++ b/src/main/java/de/bixilon/minosoft/physics/parts/CollisionMovementPhysics.kt
@@ -32,13 +32,12 @@ import de.bixilon.minosoft.data.world.iterator.WorldIterator
 import de.bixilon.minosoft.gui.rendering.util.vec.vec3.Vec3dUtil.EMPTY
 import de.bixilon.minosoft.gui.rendering.util.vec.vec3.Vec3iUtil.EMPTY
 import de.bixilon.minosoft.physics.entities.EntityPhysics
-import it.unimi.dsi.fastutil.objects.ObjectOpenHashSet
 import kotlin.math.abs
 
 object CollisionMovementPhysics {
 
     fun World.collectCollisions(context: CollisionContext, movement: Vec3d, aabb: AABB, chunk: Chunk?, predicate: CollisionPredicate? = null): VoxelShape {
-        val shapes: MutableSet<AABB> = ObjectOpenHashSet()
+        val shapes: ArrayList<AABB> = ArrayList()
         // TODO: add entity collisions (boat, shulker)
         // TODO: add world border collision shape