diff --git a/src/rt/rust_task.cpp b/src/rt/rust_task.cpp
index 348b4fce107..a2887d986f5 100644
--- a/src/rt/rust_task.cpp
+++ b/src/rt/rust_task.cpp
@@ -18,8 +18,8 @@
 // FIXME: We want this to be 128 but need to slim the red zone calls down
 #define RZ_LINUX_32 (1024*2)
 #define RZ_LINUX_64 (1024*2)
-#define RZ_MAC_32   (1024*10)
-#define RZ_MAC_64   (1024*10)
+#define RZ_MAC_32   (1024*20)
+#define RZ_MAC_64   (1024*20)
 #define RZ_WIN_32   (1024*20)
 #define RZ_BSD_32   (1024*20)
 #define RZ_BSD_64   (1024*20)