diff --git a/src/wp-includes/option.php b/src/wp-includes/option.php
index 265b0bdbe0..f8f3180d5c 100644
--- a/src/wp-includes/option.php
+++ b/src/wp-includes/option.php
@@ -2020,6 +2020,11 @@ function register_initial_settings() {
 		)
 	);
 
+	register_setting( 'permalink', 'permalink_structure', array(
+		'show_in_rest' => true,
+		'type'         => 'string',
+		'description'  => __( 'Custom URL structure for permalinks and archives.' ),
+	) );
 }
 
 /**
diff --git a/tests/phpunit/tests/rest-api/rest-settings-controller.php b/tests/phpunit/tests/rest-api/rest-settings-controller.php
index 1be304dd92..dcf2d57af3 100644
--- a/tests/phpunit/tests/rest-api/rest-settings-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-settings-controller.php
@@ -72,6 +72,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 			'posts_per_page',
 			'default_ping_status',
 			'default_comment_status',
+			'permalink_structure',
 		);
 
 		if ( ! is_multisite() ) {