diff --git a/src/Illuminate/Support/Collection.php b/src/Illuminate/Support/Collection.php
index 78b503bd4926..0ea82955c340 100644
--- a/src/Illuminate/Support/Collection.php
+++ b/src/Illuminate/Support/Collection.php
@@ -1049,7 +1049,7 @@ public function partition($callback)
         $callback = $this->valueRetriever($callback);
 
         foreach ($this->items as $key => $item) {
-            $partitions[(int) ! $callback($item)][$key] = $item;
+            $partitions[(int) ! $callback($item, $key)][$key] = $item;
         }
 
         return new static($partitions);
diff --git a/tests/Support/SupportCollectionTest.php b/tests/Support/SupportCollectionTest.php
index 39a2d1c78445..ffa46c8a7f78 100755
--- a/tests/Support/SupportCollectionTest.php
+++ b/tests/Support/SupportCollectionTest.php
@@ -2138,6 +2138,19 @@ public function testPartition()
         $this->assertEquals([6, 7, 8, 9, 10], $secondPartition->values()->toArray());
     }
 
+    public function testPartitionCallbackWithKey()
+    {
+        $collection = new Collection(['zero', 'one','two', 'three']);
+
+        list($even, $odd) = $collection->partition(function ($item, $index) {
+            return $index % 2 === 0;
+        });
+
+        $this->assertEquals(['zero', 'two'], $even->values()->toArray());
+
+        $this->assertEquals(['one', 'three'], $odd->values()->toArray());
+    }
+
     public function testPartitionByKey()
     {
         $courses = new Collection([