diff --git a/compiler-rt/test/tsan/java_finalizer2.cpp b/compiler-rt/test/tsan/java_finalizer2.cpp
index f2590f7c40b9d..0cacf3f9adfd7 100644
--- a/compiler-rt/test/tsan/java_finalizer2.cpp
+++ b/compiler-rt/test/tsan/java_finalizer2.cpp
@@ -47,7 +47,7 @@ void *Ballast(void *p) {
 }
 
 int main() {
-  Heap* heap = (Heap*)calloc(sizeof(Heap), 1);
+  Heap* heap = (Heap*)calloc(sizeof(Heap), 2) + 1;
   __tsan_java_init((jptr)heap, sizeof(*heap));
   __tsan_java_alloc((jptr)heap, sizeof(*heap));
   // Ballast threads merely make the bug a bit easier to trigger.