diff --git a/debootstrap.mk b/debootstrap.mk
index d4a5cb2..61d6d4d 100644
--- a/debootstrap.mk
+++ b/debootstrap.mk
@@ -28,7 +28,7 @@
 	cd $(ROOTDIR)/cache && \
 		sha256sum $(notdir $(DEBOOTSTRAP_TARBALL)) > $(DEBOOTSTRAP_TARBALL_SHA256)
 
-make-bootstrap-tarball: $(ROOTDIR)/build/debootstrap.mk
+make-bootstrap-tarball: $(ROOTDIR)/build/debootstrap.mk $(ROOTDIR)/build/preamble.mk
 	mkdir -p $(PRODUCT_OUT)/obj/DEBOOTSTRAP
 	mkdir -p $(ROOTDIR)/cache
 	debootstrap \
diff --git a/rootfs.mk b/rootfs.mk
index e871c50..1e59dbe 100644
--- a/rootfs.mk
+++ b/rootfs.mk
@@ -64,10 +64,11 @@
 	sudo $(ROOTDIR)/build/fix_permissions.sh -p $(ROOTDIR)/build/permissions.txt -t $(ROOTFS_DIR)
 	sudo umount -R $(ROOTFS_DIR)/{dev,proc,sys}
 
-$(ROOTFS_RAW_IMG):
+$(ROOTFS_RAW_IMG): $(DEBOOTSTRAP_TARBALL) $(ROOTDIR)/build/debootstrap.mk $(ROOTDIR)/build/preamble.mk
 	+make -f $(ROOTDIR)/build/debootstrap.mk validate-bootstrap-tarball
 
 	mkdir -p $(ROOTFS_DIR)
+	rm -f $(ROOTFS_RAW_IMG)
 	fallocate -l 2G $(ROOTFS_RAW_IMG)
 	mkfs.ext4 -j $(ROOTFS_RAW_IMG)
 	tune2fs -o discard $(ROOTFS_RAW_IMG)