diff --git a/src/wp-includes/post-functions.php b/src/wp-includes/post-functions.php
index 1c410d7674..ea731753ac 100644
--- a/src/wp-includes/post-functions.php
+++ b/src/wp-includes/post-functions.php
@@ -1393,6 +1393,8 @@ function _get_custom_object_labels( $object, $nohier_vs_hier_defaults ) {
 		$defaults[$key] = $object->hierarchical ? $value[1] : $value[0];
 	}
 	$labels = array_merge( $defaults, $object->labels );
+	$object->labels = (object) $object->labels;
+	
 	return (object) $labels;
 }
 
diff --git a/tests/phpunit/tests/post/types.php b/tests/phpunit/tests/post/types.php
index 5a1be694d8..02d4590da8 100644
--- a/tests/phpunit/tests/post/types.php
+++ b/tests/phpunit/tests/post/types.php
@@ -142,4 +142,21 @@ class Tests_Post_Types extends WP_UnitTestCase {
 
 		$this->assertFalse( post_type_exists( 'foo' ) );
 	}
+
+	/**
+	 * @ticket 33023
+	 */
+	public function test_get_post_type_object_casting() {
+		register_post_type( 'foo' );
+
+		$before = get_post_type_object( 'foo' )->labels;
+
+		get_post_type_labels( get_post_type_object( 'foo' ) );
+
+		$after = get_post_type_object( 'foo' )->labels;
+
+		$this->assertEquals( $before, $after );
+
+		_unregister_post_type( 'foo' );
+	}
 }