diff --git a/src/wp-admin/menu.php b/src/wp-admin/menu.php
index a756fa40f3..1602150cac 100644
--- a/src/wp-admin/menu.php
+++ b/src/wp-admin/menu.php
@@ -380,7 +380,7 @@ $menu[75]                     = array( __( 'Tools' ), 'edit_posts', 'tools.php',
 if ( is_multisite() && ! is_main_site() ) {
 	$submenu['tools.php'][35] = array( __( 'Delete Site' ), 'delete_site', 'ms-delete-site.php' );
 }
-if ( ! is_multisite() && defined( 'WP_ALLOW_MULTISITE' ) && WP_ALLOW_MULTISITE ) {
+if ( ! is_multisite() ) {
 	$submenu['tools.php'][50] = array( __( 'Network Setup' ), 'setup_network', 'network.php' );
 }
 
diff --git a/src/wp-admin/network.php b/src/wp-admin/network.php
index 99638dabc3..d9f44bf48a 100644
--- a/src/wp-admin/network.php
+++ b/src/wp-admin/network.php
@@ -26,7 +26,7 @@ if ( is_multisite() ) {
 	}
 
 	if ( ! defined( 'MULTISITE' ) ) {
-		wp_die( __( 'The Network creation panel is not for WordPress MU networks.' ) );
+		wp_die( __( 'The Network creation panel is not for WordPress Multisite networks.' ) );
 	}
 }
 
@@ -37,17 +37,6 @@ foreach ( $wpdb->tables( 'ms_global' ) as $table => $prefixed_table ) {
 	$wpdb->$table = $prefixed_table;
 }
 
-if ( ! network_domain_check() && ( ! defined( 'WP_ALLOW_MULTISITE' ) || ! WP_ALLOW_MULTISITE ) ) {
-	wp_die(
-		printf(
-			/* translators: 1: WP_ALLOW_MULTISITE, 2: wp-config.php */
-			__( 'You must define the %1$s constant as true in your %2$s file to allow creation of a Network.' ),
-			'<code>WP_ALLOW_MULTISITE</code>',
-			'<code>wp-config.php</code>'
-		)
-	);
-}
-
 if ( is_network_admin() ) {
 	// Used in the HTML title tag.
 	$title       = __( 'Network Setup' );
diff --git a/src/wp-admin/network/menu.php b/src/wp-admin/network/menu.php
index 73cc86b234..35019033ea 100644
--- a/src/wp-admin/network/menu.php
+++ b/src/wp-admin/network/menu.php
@@ -107,7 +107,7 @@ $submenu['plugins.php'][10] = array( __( 'Add New Plugin' ), 'install_plugins',
 $submenu['plugins.php'][15] = array( __( 'Plugin File Editor' ), 'edit_plugins', 'plugin-editor.php' );
 
 $menu[25] = array( __( 'Settings' ), 'manage_network_options', 'settings.php', '', 'menu-top menu-icon-settings', 'menu-settings', 'dashicons-admin-settings' );
-if ( defined( 'MULTISITE' ) && defined( 'WP_ALLOW_MULTISITE' ) && WP_ALLOW_MULTISITE ) {
+if ( defined( 'MULTISITE' ) ) {
 	$submenu['settings.php'][5]  = array( __( 'Network Settings' ), 'manage_network_options', 'settings.php' );
 	$submenu['settings.php'][10] = array( __( 'Network Setup' ), 'setup_network', 'setup.php' );
 }