diff --git a/target/linux/at91/image/sam9x.mk b/target/linux/at91/image/sam9x.mk
index 4de96097758..409e43ca6e9 100644
--- a/target/linux/at91/image/sam9x.mk
+++ b/target/linux/at91/image/sam9x.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)
 
diff --git a/target/linux/at91/image/sama5.mk b/target/linux/at91/image/sama5.mk
index 39db3e1cd02..7f4dd3316a8 100644
--- a/target/linux/at91/image/sama5.mk
+++ b/target/linux/at91/image/sama5.mk
@@ -39,7 +39,7 @@ define Build/at91-sdcard
   ./gen_at91_sdcard_img.sh \
 	$@.img \
 	$@.boot \
-	$(KDIR)/root.ext4 \
+	$(IMAGE_ROOTFS) \
 	$(AT91_SD_BOOT_PARTSIZE) \
 	$(CONFIG_TARGET_ROOTFS_PARTSIZE)