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-rw-r--r--src/chunk_mmap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/chunk_mmap.c b/src/chunk_mmap.c
index f95ae75..73fc497 100644
--- a/src/chunk_mmap.c
+++ b/src/chunk_mmap.c
@@ -9,7 +9,7 @@ chunk_alloc_mmap_slow(size_t size, size_t alignment, bool *zero, bool *commit)
void *ret;
size_t alloc_size;
- alloc_size = size + alignment;
+ alloc_size = size + alignment - PAGE;
/* Beware size_t wrap-around. */
if (alloc_size < size)
return (NULL);