diff --git a/src/heap.c b/src/heap.c
index f4654464..cf22dcc1 100644
--- a/src/heap.c
+++ b/src/heap.c
@@ -532,7 +532,7 @@ static bool mi_heap_visit_areas_page(mi_heap_t* heap, mi_page_queue_t* pq, mi_pa
   xarea.area.reserved = page->reserved * bsize;
   xarea.area.committed = page->capacity * bsize;
   xarea.area.blocks = _mi_page_start(_mi_page_segment(page), page, NULL);
-  xarea.area.used = page->used * bsize;
+  xarea.area.used = page->used;   // number of blocks in use (#553)
   xarea.area.block_size = ubsize;
   xarea.area.full_block_size = bsize;
   return fun(heap, &xarea, arg);