diff --git a/uninstall.php b/uninstall.php
index a02a3af..8a8fc95 100644
--- a/uninstall.php
+++ b/uninstall.php
@@ -15,7 +15,15 @@ if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
 // dropping it loses no data; LatePoint's tables are left untouched.
 global $wpdb;
 
-$tmdo_latepoint_blogs = is_multisite() ? get_sites( array( 'fields' => 'ids' ) ) : array( get_current_blog_id() );
+// 'number' => 0: get_sites() returns only 100 sites by default.
+$tmdo_latepoint_blogs = is_multisite()
+	? get_sites(
+		array(
+			'fields' => 'ids',
+			'number' => 0,
+		)
+	)
+	: array( get_current_blog_id() );
 foreach ( $tmdo_latepoint_blogs as $tmdo_latepoint_blog ) {
 	if ( is_multisite() ) {
 		switch_to_blog( $tmdo_latepoint_blog );