diff --git a/src/tests/util/rb_tree.cpp b/src/tests/util/rb_tree.cpp
index 9dc78010bd..4ac97322b3 100644
--- a/src/tests/util/rb_tree.cpp
+++ b/src/tests/util/rb_tree.cpp
@@ -241,7 +241,9 @@ int main() {
     tst3();
     tst4();
     tst5();
+#if !defined(__APPLE__) && defined(LEAN_MULTI_THREAD)
     tst6();
+#endif
     return has_violations() ? 1 : 0;
 }