diff --git a/tests/benchmarks/corelib/kernel/qobject/tst_bench_qobject.cpp b/tests/benchmarks/corelib/kernel/qobject/tst_bench_qobject.cpp
index 99c15f6317b..6ea09171121 100644
--- a/tests/benchmarks/corelib/kernel/qobject/tst_bench_qobject.cpp
+++ b/tests/benchmarks/corelib/kernel/qobject/tst_bench_qobject.cpp
@@ -59,7 +59,13 @@ inline void allocator()
     // prepare OS (no other tasks, CPU and RAM reservations) to run this test, or use
     // instruction counting which seems to be less fragile.
 
-    const int count = 256 * 1024;
+#ifdef Q_OS_WIN
+    // Stack space available is 1MB, but each pointer is 8 bytes, so leave us
+    // 32KB space to work with:
+    constexpr int count = 124 * 1024;
+#else
+    constexpr int count = 256 * 1024;
+#endif
 
     QScopedPointer<T> objects[count];
     QBENCHMARK_ONCE {