--- a/mono/sgen/sgen-archdep.h  2016-10-10 11:22:26.607082785 -0500
+++ b/mono/sgen/sgen-archdep.h  2016-10-10 11:22:48.526184527 -0500
@@ -45,6 +45,8 @@

 #elif defined(TARGET_ARM64)

+#define ARCH_MIN_MS_BLOCK_SIZE (64*1024)
+#define ARCH_MIN_MS_BLOCK_SIZE_SHIFT   16
 #if defined(__APPLE__)
 #define REDZONE_SIZE	128
 #else