diff --git a/target/linux/at91/image/sama7.mk b/target/linux/at91/image/sama7.mk
index bf1704dfb33..8d6f67d80e6 100644
--- a/target/linux/at91/image/sama7.mk
+++ b/target/linux/at91/image/sama7.mk
@@ -35,7 +35,7 @@ define Build/at91-sdcard
   ./gen_at91_sdcard_img.sh \
 	$@.img \
 	$@.boot \
-	$(KDIR)/root.ext4 \
+	$(IMAGE_ROOTFS) \
 	$(AT91_SD_BOOT_PARTSIZE) \
 	$(CONFIG_TARGET_ROOTFS_PARTSIZE)