diff --git a/lib/pnglib.js b/lib/pnglib.js
index eeac098..0a55917 100644
--- a/lib/pnglib.js
+++ b/lib/pnglib.js
@@ -201,7 +201,7 @@ module.exports = function(width,height,depth) {
         crc32(this.buffer, this.iend_offs, this.iend_size);
 
         // convert PNG to string
-        return "\211PNG\r\n\032\n"+this.buffer.join('');
+        return "\x89PNG\r\n\x1A\n"+this.buffer.join('');
     }
 };