diff --git a/js/src/devtools/gc-ubench/benchmarks/selfCyclicWeakMap.js b/js/src/devtools/gc-ubench/benchmarks/selfCyclicWeakMap.js
new file mode 100644
index 000000000000..0a5ffb08463c
--- /dev/null
+++ b/js/src/devtools/gc-ubench/benchmarks/selfCyclicWeakMap.js
@@ -0,0 +1,29 @@
+window.tests.set('selfCyclicWeakMap', (function() {
+var garbage = [];
+var garbageIndex = 0;
+return {
+    description: "var wm = new WeakMap(); wm[k1] = k2; wm[k2] = k3; ...",
+
+    defaultGarbagePerFrame: "1K",
+    defaultGarbageTotal: "1K",
+
+    load: (N) => { garbage = new Array(N); },
+
+    unload: () => { garbage = []; garbageIndex = 0; },
+
+    makeGarbage: (M) => {
+        var wm = new WeakMap();
+        var initialKey = {};
+        var key = initialKey;
+        var value = {};
+        for (var i = 0; i < M; i++) {
+            wm.set(key, value);
+            key = value;
+            value = {};
+        }
+        garbage[garbageIndex++] = [ initialKey, wm ];
+        if (garbageIndex == garbage.length)
+            garbageIndex = 0;
+    }
+};
+})());
diff --git a/js/src/devtools/gc-ubench/index.html b/js/src/devtools/gc-ubench/index.html
index 76d436b25879..9fd78395bc9c 100644
--- a/js/src/devtools/gc-ubench/index.html
+++ b/js/src/devtools/gc-ubench/index.html
@@ -11,6 +11,7 @@
   <script src="benchmarks/globalArrayLargeArray.js"></script>
   <script src="benchmarks/globalArrayObjectLiteral.js"></script>
   <script src="benchmarks/globalArrayReallocArray.js"></script>
+  <script src="benchmarks/selfCyclicWeakMap.js"></script>
 
   <script src="harness.js"></script>