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-rw-r--r--libc/stdlib/malloc/heap.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/libc/stdlib/malloc/heap.h b/libc/stdlib/malloc/heap.h
index 13e37ea6c..29a32c0bb 100644
--- a/libc/stdlib/malloc/heap.h
+++ b/libc/stdlib/malloc/heap.h
@@ -78,7 +78,9 @@ struct heap_free_area
#define HEAP_DECLARE_STATIC_FREE_AREA(name, size) \
static struct \
{ \
- HEAP_GRANULARITY_TYPE space[((size) - sizeof (struct heap_free_area)) \
+ HEAP_GRANULARITY_TYPE space[((size) \
+ - sizeof (struct heap_free_area) \
+ + (HEAP_GRANULARITY - 1)) \
/ HEAP_GRANULARITY]; \
struct heap_free_area _fa; \
} name = { { (HEAP_GRANULARITY_TYPE)0 }, { (size), 0, 0 } }