diff --git a/src/wp-admin/includes/class-wp-site-health.php b/src/wp-admin/includes/class-wp-site-health.php
index 4fec62defa4cd..b4231e3f640fc 100644
--- a/src/wp-admin/includes/class-wp-site-health.php
+++ b/src/wp-admin/includes/class-wp-site-health.php
@@ -2598,8 +2598,11 @@ public function get_autoloaded_options_size() {
 
 		$total_length = 0;
 
-		foreach ( $alloptions as $option_name => $option_value ) {
-			$total_length += strlen( $option_value );
+		foreach ( $alloptions as $option_value ) {
+			if ( is_array( $option_value ) || is_object( $option_value ) ) {
+				$option_value = maybe_serialize( $option_value );
+			}
+			$total_length += strlen( (string) $option_value );
 		}
 
 		return $total_length;