diff --git a/wp-includes/ms-default-filters.php b/wp-includes/ms-default-filters.php
index 70d725e264..e533252f4b 100644
--- a/wp-includes/ms-default-filters.php
+++ b/wp-includes/ms-default-filters.php
@@ -22,7 +22,6 @@ add_action( 'sanitize_user', 'strtolower' );
 
 // Blogs
 add_filter( 'wpmu_validate_blog_signup', 'signup_nonce_check' );
-add_action( 'wpmu_new_blog', 'wpmu_activate_network_plugins', 9 );
 add_action( 'wpmu_new_blog', 'wpmu_log_new_registrations', 10, 2 );
 add_action( 'wpmu_new_blog', 'newblog_notify_siteadmin', 10, 2 );
 
diff --git a/wp-includes/ms-functions.php b/wp-includes/ms-functions.php
index ee4c8d0972..54296e8246 100644
--- a/wp-includes/ms-functions.php
+++ b/wp-includes/ms-functions.php
@@ -1224,26 +1224,6 @@ function update_posts_count( $deprecated = '' ) {
 	update_option( 'post_count', (int) $wpdb->get_var( "SELECT COUNT(ID) FROM {$wpdb->posts} WHERE post_status = 'publish' and post_type = 'post'" ) );
 }
 
-/**
- * Fires activation hooks for all active network plugins
- *
- * @since 3.1.0
- *
- * @param int $blog_id Blog ID
- */
-function wpmu_activate_network_plugins( $blog_id ) {
-	switch_to_blog( $blog_id );
-
-	$active_sitewide_plugins = (array) get_site_option( 'active_sitewide_plugins', array() );
-
-	foreach ( array_keys( $active_sitewide_plugins ) as $plugin ) {
-		do_action( 'activate_' . $plugin, false );
-		do_action( 'activate_plugin', $plugin, false );
-	}
-
-	restore_current_blog();
-}
-
 function wpmu_log_new_registrations( $blog_id, $user_id ) {
 	global $wpdb;
 	$user = new WP_User( (int) $user_id );