diff --git a/src/_h5ai/server/php/inc/Archive.php b/src/_h5ai/server/php/inc/Archive.php
index 80482eb3..16829753 100644
--- a/src/_h5ai/server/php/inc/Archive.php
+++ b/src/_h5ai/server/php/inc/Archive.php
@@ -153,7 +153,7 @@ class Archive {
 			if ($code == App::$MAGIC_SEQUENCE && !$this->app->is_ignored($n)) {
 
 				$real_file = $this->app->get_abs_path($href);
-				$archived_file = preg_replace("!^" . normalize_path($this->app->get_abs_path(), true) . "!", "", $real_file);
+				$archived_file = preg_replace("!^" . preg_quote(normalize_path($this->app->get_abs_path(), true)) . "!", "", $real_file);
 
 				if (is_dir($real_file)) {
 					$this->add_dir($real_file, $archived_file);