diff --git a/memory.js b/memory.js
index e641d6b..662970b 100644
--- a/memory.js
+++ b/memory.js
@@ -1,14 +1,22 @@
 /* eslint-disable camelcase */
+if (!window) var { MessageChannel } = require('worker' + '_threads')
 
 function sodium_malloc (n) {
   return new Uint8Array(n)
 }
 
+const sink = new MessageChannel()
+function sodium_free (n) {
+  sodium_memzero(n)
+  sink.port1.postMessage(n.buffer, [n.buffer])
+}
+
 function sodium_memzero (arr) {
   arr.fill(0)
 }
 
 module.exports = {
   sodium_malloc,
+  sodium_free,
   sodium_memzero
 }