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-rw-r--r--malloc/arena.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/malloc/arena.c b/malloc/arena.c
index 6f0a9df8f1..e96b3b42a6 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -24,7 +24,11 @@
 
 #define HEAP_MIN_SIZE (32*1024)
 #ifndef HEAP_MAX_SIZE
-#define HEAP_MAX_SIZE (1024*1024) /* must be a power of two */
+# ifdef DEFAULT_MMAP_THRESHOLD_MAX
+#  define HEAP_MAX_SIZE DEFAULT_MMAP_THRESHOLD_MAX
+# else
+#  define HEAP_MAX_SIZE (1024*1024) /* must be a power of two */
+# endif
 #endif
 
 /* HEAP_MIN_SIZE and HEAP_MAX_SIZE limit the size of mmap()ed heaps