diff --git a/lib/primitiveValues/string.js b/lib/primitiveValues/string.js
index e9e4d85..bf9ec32 100644
--- a/lib/primitiveValues/string.js
+++ b/lib/primitiveValues/string.js
@@ -25,6 +25,13 @@ exports.tag = tag
 // http://graphemica.com/blocks/control-pictures where applicable.
 function basicEscape (string) {
   return string.replace(/\\/g, '\\\\')
+    .replace(/\x00/g, "␀")
+    .replace(/\x1b/g, "␛")
+    .replace(/\x11/g, "␑")
+    .replace(/\x12/g, "␒")
+    .replace(/\x13/g, "␓")
+    .replace(/\x14/g, "␔")
+
 }
 
 const CRLF_CONTROL_PICTURE = '\u240D\u240A'