diff --git a/arch/powerpc/platforms/powernv/opal-flash.c b/arch/powerpc/platforms/powernv/opal-flash.c
index 4aeae4f36e1d718f865a0722194fc7991acec778..16e571ba4c600a1ce9846122eed6456894e2d770 100644
--- a/arch/powerpc/platforms/powernv/opal-flash.c
+++ b/arch/powerpc/platforms/powernv/opal-flash.c
@@ -76,8 +76,8 @@
 /* Validate buffer size */
 #define VALIDATE_BUF_SIZE	4096
 
-/* XXX: Assume candidate image size is <= 256MB */
-#define MAX_IMAGE_SIZE	0x10000000
+/* XXX: Assume candidate image size is <= 1GB */
+#define MAX_IMAGE_SIZE	0x40000000
 
 /* Flash sg list version */
 #define SG_LIST_VERSION (1UL)