diff --git a/src/init.c b/src/init.c
index 622a5eb0..602a2f7a 100644
--- a/src/init.c
+++ b/src/init.c
@@ -346,8 +346,8 @@ void mi_thread_init(void) mi_attr_noexcept
   // don't further initialize for the main thread
   if (_mi_is_main_thread()) return;
 
-  mi_heap_t* heap = mi_get_default_heap();
-  if (mi_heap_is_initialized(heap)) { _mi_stat_increase(&mi_get_default_heap()->tld->stats.threads, 1); }
+  mi_heap_t* const heap = mi_get_default_heap();
+  if (mi_heap_is_initialized(heap)) { _mi_stat_increase(&heap->tld->stats.threads, 1); }
 
   //_mi_verbose_message("thread init: 0x%zx\n", _mi_thread_id());
 }