diff --git a/tools/firmware-utils/src/mkfwimage.c b/tools/firmware-utils/src/mkfwimage.c
index e726bef8af..83ce6cf3db 100644
--- a/tools/firmware-utils/src/mkfwimage.c
+++ b/tools/firmware-utils/src/mkfwimage.c
@@ -55,13 +55,13 @@ fw_layout_t fw_layout_data[] = {
 		.name		=	"RS",
 		.kern_start	=	0xbf030000,
 		.kern_entry	=	0x80060000,
-		.firmware_max_length=	0x00640000,
+		.firmware_max_length=	0x00B00000,
 	},
 	{
 		.name		=	"RSPRO",
 		.kern_start	=	0xbf030000,
 		.kern_entry	=	0x80060000,
-		.firmware_max_length=	0x00640000,
+		.firmware_max_length=	0x00B00000,
 	},
 	{
 		.name		=	"LS-SR71",