diff --git a/board/olimex/a20_olinuxino/genimage.cfg b/board/olimex/a20_olinuxino/genimage.cfg
index 8ea24ccab8..fc2f7f8d76 100644
--- a/board/olimex/a20_olinuxino/genimage.cfg
+++ b/board/olimex/a20_olinuxino/genimage.cfg
@@ -6,6 +6,7 @@ image sdcard.img {
 		in-partition-table = "no"
 		image = "u-boot-sunxi-with-spl.bin"
 		offset = 8192
+		size = 1040384 # 1MB - 8192
 	}
 
 	partition rootfs {