diff --git a/lib/weak-set.js b/lib/weak-set.js
index 6f94988..1ef6b6c 100644
--- a/lib/weak-set.js
+++ b/lib/weak-set.js
@@ -1,3 +1,5 @@
+const { WeakSet } = global;
+
 /**
  * IMPORTANT: MockWeakSet intentionally omits unused methods (like delete)
  */
@@ -13,7 +15,5 @@ function MockWeakSet(mws = []) {
 }
 
 export default function MaybeWeakSet(iterable) {
-	// WeakSet causes a horrible memory leak in node so just use the mock for now
-	// https://github.com/nodejs/node/issues/6180
-	return MockWeakSet(iterable);
+	return WeakSet ? new WeakSet(iterable) : MockWeakSet(iterable);
 }
diff --git a/package.json b/package.json
index 91241e9..f173d22 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "bitclock",
-  "version": "0.2.0-beta.2",
+  "version": "0.2.0-beta.3",
   "license": "Apache-2.0",
   "repository": {
     "type": "git",