diff --git a/libraries/wutnewlib/wut_sbrk.c b/libraries/wutnewlib/wut_sbrk.c
index b8bf0173..47f8d045 100644
--- a/libraries/wutnewlib/wut_sbrk.c
+++ b/libraries/wutnewlib/wut_sbrk.c
@@ -39,7 +39,7 @@ __init_wut_sbrk_heap()
       return;
    }
 
-   if (__wut_heap_max_size) {
+   if (&__wut_heap_max_size) {
       // Use default heap
       sHeapBase = MEMAllocFromDefaultHeap(__wut_heap_max_size);
       sHeapMaxSize = __wut_heap_max_size;