diff --git a/js/src/jit-test/tests/gc/bug-975959.js b/js/src/jit-test/tests/gc/bug-975959.js
index 654eb267bcd4..1487c61cc46b 100644
--- a/js/src/jit-test/tests/gc/bug-975959.js
+++ b/js/src/jit-test/tests/gc/bug-975959.js
@@ -1,3 +1,6 @@
+if (!getBuildConfiguration().parallelJS)
+  quit(0);
+
 try {
     y = z = [];
     y[1] = x