diff --git a/spec/drupol/collection/CollectionSpec.php b/spec/drupol/collection/CollectionSpec.php
index bf3a58774..046a10cef 100644
--- a/spec/drupol/collection/CollectionSpec.php
+++ b/spec/drupol/collection/CollectionSpec.php
@@ -229,7 +229,7 @@ public function it_can_chunk(): void
         $this::with(\range('A', 'F'))
             ->chunk(2)
             ->all()
-            ->shouldReturn([[0 => 'A', 1 => 'B'], [2 => 'C', 3 => 'D'], [4 => 'E', 5 => 'F']]);
+            ->shouldReturn([[0 => 'A', 1 => 'B'], [0 => 'C', 1 => 'D'], [0 => 'E', 1 => 'F']]);
 
         $this::with(\range('A', 'F'))
             ->chunk(0)
@@ -239,7 +239,7 @@ public function it_can_chunk(): void
         $this::with(\range('A', 'F'))
             ->chunk(1)
             ->all()
-            ->shouldReturn([[0 => 'A'], [1 => 'B'], [2 => 'C'], [3 => 'D'], [4 => 'E'], [5 => 'F']]);
+            ->shouldReturn([[0 => 'A'], [0 => 'B'], [0 => 'C'], [0 => 'D'], [0 => 'E'], [0 => 'F']]);
     }
 
     public function it_can_collapse(): void
diff --git a/src/Operation/Chunk.php b/src/Operation/Chunk.php
index b88a3415e..d485d5383 100644
--- a/src/Operation/Chunk.php
+++ b/src/Operation/Chunk.php
@@ -44,7 +44,7 @@ public function on(iterable $collection): \Closure
             $iterator = new ClosureIterator(
                 static function () use ($collection) {
                     foreach ($collection as $key => $value) {
-                        yield $key => $value;
+                        yield $value;
                     }
                 }
             );
@@ -53,7 +53,7 @@ static function () use ($collection) {
                 $values = [];
 
                 for ($i = 0; $iterator->valid() && $i < $length; $i++, $iterator->next()) {
-                    $values[$iterator->key()] = $iterator->current();
+                    $values[] = $iterator->current();
                 }
 
                 yield new \ArrayIterator($values);