diff --git a/compiler-rt/test/tsan/Darwin/gcd-barrier.mm b/compiler-rt/test/tsan/Darwin/gcd-barrier.mm
--- a/compiler-rt/test/tsan/Darwin/gcd-barrier.mm
+++ b/compiler-rt/test/tsan/Darwin/gcd-barrier.mm
@@ -28,7 +28,8 @@
       global = 43;
     });
 
-    dispatch_async(bgq, ^{
+    barrier_init(&barrier, 2);
+    dispatch_async(q, ^{
       barrier_wait(&barrier);
       global = 44;
     });