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-rw-r--r--malloc/arena.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/malloc/arena.c b/malloc/arena.c
index e96b3b42a6..6f4b0c497b 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -25,7 +25,7 @@
#define HEAP_MIN_SIZE (32*1024)
#ifndef HEAP_MAX_SIZE
# ifdef DEFAULT_MMAP_THRESHOLD_MAX
-# define HEAP_MAX_SIZE DEFAULT_MMAP_THRESHOLD_MAX
+# define HEAP_MAX_SIZE (2 * DEFAULT_MMAP_THRESHOLD_MAX)
# else
# define HEAP_MAX_SIZE (1024*1024) /* must be a power of two */
# endif