diff --git a/test/tests-6to5-playground.js b/test/tests-6to5-playground.js
index 841d6f78c4..d0d5b0af8a 100644
--- a/test/tests-6to5-playground.js
+++ b/test/tests-6to5-playground.js
@@ -197,7 +197,9 @@ test("var foo = { memo bar() {} };",
 
 // Memoization assignment operator
 
-testFail("obj ?= 2;", "You can only use member expressions in memoization assignment (1:0)");
+testFail("obj ?= 2;", "You can only use member expressions in memoization assignment (1:0)", {
+  playground: true
+});
 
 test("obj.x ?= 2;", {
   type: "Program",