diff --git a/src/_h5ai/php/inc/ZipIt.php b/src/_h5ai/php/inc/ZipIt.php
index 41b9b416..78c23165 100644
--- a/src/_h5ai/php/inc/ZipIt.php
+++ b/src/_h5ai/php/inc/ZipIt.php
@@ -28,7 +28,7 @@ class ZipIt {
 
 		$zip->addEmptyDir("/");
 		foreach ($hrefs as $href) {
-			$d = H5ai::normalize_path(dirname($href, true));
+			$d = H5ai::normalize_path(dirname($href), true);
 			$n = basename($href);
 			$code = $this->h5ai->getHttpCode($d);
 			if ($code == 401) {