diff --git a/target/linux/bcm27xx/image/Makefile b/target/linux/bcm27xx/image/Makefile
index 12ac0012a49..e45f53de8e1 100644
--- a/target/linux/bcm27xx/image/Makefile
+++ b/target/linux/bcm27xx/image/Makefile
@@ -49,6 +49,7 @@ define Build/boot-2711
 endef
 
 define Build/sdcard-img
+	SIGNATURE="$(IMG_PART_SIGNATURE)" \
 	./gen_rpi_sdcard_img.sh $@ $@.boot $(IMAGE_ROOTFS) \
 		$(CONFIG_TARGET_KERNEL_PARTSIZE) $(CONFIG_TARGET_ROOTFS_PARTSIZE)
 endef
diff --git a/target/linux/bcm27xx/image/gen_rpi_sdcard_img.sh b/target/linux/bcm27xx/image/gen_rpi_sdcard_img.sh
index 488a3517c73..8d33e4f54c1 100755
--- a/target/linux/bcm27xx/image/gen_rpi_sdcard_img.sh
+++ b/target/linux/bcm27xx/image/gen_rpi_sdcard_img.sh
@@ -19,7 +19,7 @@ kernel_type=c
 rootfs_type=83
 sect=63
 
-set $(ptgen -o $OUTPUT -h $head -s $sect -l $align -t $kernel_type -p ${BOOTFSSIZE}M -t $rootfs_type -p ${ROOTFSSIZE}M)
+set $(ptgen -o $OUTPUT -h $head -s $sect -l $align -t $kernel_type -p ${BOOTFSSIZE}M -t $rootfs_type -p ${ROOTFSSIZE}M ${SIGNATURE:+-S 0x$SIGNATURE})
 
 BOOTOFFSET="$(($1 / 512))"
 ROOTFSOFFSET="$(($3 / 512))"