diff --git a/test/test.js b/test/test.js
index 7efdd1a6e..002ccbcc8 100644
--- a/test/test.js
+++ b/test/test.js
@@ -2347,7 +2347,7 @@
         filterCount = mapCount = 0;
         deepEqual(combined(_.range(100)), [4, 16]);
 
-        if (!isNpm && WeakMap && _.support.funcNames) {
+        if (!isNpm && WeakMap && WeakMap.name) {
           strictEqual(filterCount, 5, 'filterCount');
           strictEqual(mapCount, 5, 'mapCount');
         }