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-rw-r--r--malloc/malloc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c
index f3378b90ed..a10477ed4c 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -2306,6 +2306,7 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
               else
                 {
                   p = (mchunkptr) mm;
+		  set_prev_size (p, 0);
                   set_head (p, size | IS_MMAPPED);
                 }