2 files changed, 2 insertions, 2 deletions
diff --git a/libc/stdlib/malloc/heap.h b/libc/stdlib/malloc/heap.h
index ab1a73896..b66b5ecef 100644
--- a/libc/stdlib/malloc/heap.h
+++ b/libc/stdlib/malloc/heap.h
@@ -25,7 +25,7 @@
    HEAP_GRANULARITY must be a power of 2.  Malloc depends on this being the
    same as MALLOC_ALIGNMENT.  */
 #define HEAP_GRANULARITY_TYPE	double
-#define HEAP_GRANULARITY	(sizeof (HEAP_GRANULARITY_TYPE))
+#define HEAP_GRANULARITY	(__alignof__ (HEAP_GRANULARITY_TYPE))
 
 
 /* A heap is a collection of memory blocks, from which smaller blocks
diff --git a/libc/stdlib/malloc/malloc.h b/libc/stdlib/malloc/malloc.h
index e722bc86a..b41c4b08e 100644
--- a/libc/stdlib/malloc/malloc.h
+++ b/libc/stdlib/malloc/malloc.h
@@ -12,7 +12,7 @@
  */
 
 /* The alignment we guarantee for malloc return values.  */
-#define MALLOC_ALIGNMENT	(sizeof (double))
+#define MALLOC_ALIGNMENT	(__alignof__ (double))
 
 /* The system pagesize... */
 extern size_t __pagesize;