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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