diff --git a/src/daemon/memorypool.c b/src/daemon/memorypool.c
index fa0b4d6b..4a183bcb 100644
--- a/src/daemon/memorypool.c
+++ b/src/daemon/memorypool.c
@@ -25,6 +25,11 @@
 
 #include "memorypool.h"
 
+// define MAP_ANONYMOUS for Mac OS X
+#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
+#define MAP_ANONYMOUS MAP_ANON
+#endif
+
 struct MemoryPool
 {