diff --git a/core/lib/Drupal/Component/Utility/DeprecatedArray.php b/core/lib/Drupal/Component/Utility/DeprecatedArray.php
index 88d0287232..2eb206ef58 100644
--- a/core/lib/Drupal/Component/Utility/DeprecatedArray.php
+++ b/core/lib/Drupal/Component/Utility/DeprecatedArray.php
@@ -5,7 +5,7 @@
 /**
  * An array that triggers a deprecation warning when accessed.
  */
-class DeprecatedArray implements \ArrayAccess {
+class DeprecatedArray implements \ArrayAccess, \IteratorAggregate {
 
   /**
    * The array values.
@@ -26,7 +26,7 @@ class DeprecatedArray implements \ArrayAccess {
    *
    * @param array $values
    *   The array values.
-   * @param $message
+   * @param string $message
    *   The deprecation message.
    */
   public function __construct(array $values, $message) {
@@ -66,4 +66,11 @@ public function offsetUnset($offset) {
     unset($this->values[$offset]);
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getIterator() {
+    return new \ArrayIterator($this->values);
+  }
+
 }
diff --git a/core/tests/Drupal/KernelTests/Core/Pager/PagerManagerTest.php b/core/tests/Drupal/KernelTests/Core/Pager/PagerManagerTest.php
index a03e759ad3..10428a079f 100644
--- a/core/tests/Drupal/KernelTests/Core/Pager/PagerManagerTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Pager/PagerManagerTest.php
@@ -90,6 +90,13 @@ public function testGlobalsSafety() {
     $this->assertEquals(30, $GLOBALS['pager_total_items'][0]);
     $this->assertEquals(3, $GLOBALS['pager_total'][0]);
     $this->assertEquals(10, $GLOBALS['pager_limits'][0]);
+
+    // Assert array is iterable.
+    foreach ($GLOBALS['pager_total_items'] as $pager_id => $total_items) {
+      // We only have one pager.
+      $this->assertEquals(0, $pager_id);
+      $this->assertEquals(30, $total_items);
+    }
   }
 
 }