diff --git a/src/main/php/io/archive/zip/ZipDirEntry.class.php b/src/main/php/io/archive/zip/ZipDirEntry.class.php
index ba9a62b6..154da803 100644
--- a/src/main/php/io/archive/zip/ZipDirEntry.class.php
+++ b/src/main/php/io/archive/zip/ZipDirEntry.class.php
@@ -1,6 +1,7 @@
 <?php namespace io\archive\zip;
 
 use util\Date;
+use util\Objects;
 
 /**
  * Represents a Dir entry in a zip archive
@@ -119,7 +120,7 @@ public function toString() {
       "}",
       nameof($this),
       $this->name,
-      \xp::stringOf($this->mod)
+      Objects::stringOf($this->mod)
     );
   }
 }
diff --git a/src/main/php/io/archive/zip/ZipFileEntry.class.php b/src/main/php/io/archive/zip/ZipFileEntry.class.php
index 5a763334..4f9bf3e3 100644
--- a/src/main/php/io/archive/zip/ZipFileEntry.class.php
+++ b/src/main/php/io/archive/zip/ZipFileEntry.class.php
@@ -1,6 +1,7 @@
 <?php namespace io\archive\zip;
 
 use util\Date;
+use util\Objects;
 
 /**
  * Represents a file entry in a zip archive
@@ -165,8 +166,8 @@ public function toString() {
       "}",
       nameof($this),
       $this->name,
-      \xp::stringOf($this->mod),
-      \xp::stringOf($this->compression[0]),
+      Objects::stringOf($this->mod),
+      Objects::stringOf($this->compression[0]),
       $this->compression[1],
       $this->size
     );