diff --git a/board/emulation/qemu-arm/qemu-arm.c b/board/emulation/qemu-arm/qemu-arm.c
index 6ec4200..085cbbe 100644
--- a/board/emulation/qemu-arm/qemu-arm.c
+++ b/board/emulation/qemu-arm/qemu-arm.c
@@ -28,7 +28,7 @@ static struct mm_region qemu_arm64_mem_map[] = {
 		/* RAM */
 		.virt = 0x40000000UL,
 		.phys = 0x40000000UL,
-		.size = 0xc0000000UL,
+		.size = 255UL * SZ_1G,
 		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
 			 PTE_BLOCK_INNER_SHARE
 	}, {