diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 0cd6af4669..3d5dfef220 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -47,11 +47,11 @@
 
 #include <libfdt.h>
 
-#define FDT_MAX_SIZE            0x00100000
+#define FDT_MAX_SIZE            (1 * MiB)
 
 #define FW_FILE_NAME            "skiboot.lid"
 #define FW_LOAD_ADDR            0x0
-#define FW_MAX_SIZE             0x00400000
+#define FW_MAX_SIZE             (4 * MiB)
 
 #define KERNEL_LOAD_ADDR        0x20000000
 #define KERNEL_MAX_SIZE         (256 * MiB)