diff --git a/Makefile b/Makefile
index deff150..5f2de08 100644
--- a/Makefile
+++ b/Makefile
@@ -77,7 +77,7 @@ $(qemu_disk): tmp
 	qemu-img create "$@" 4G
 
 tmp/netboot.tar.gz: tmp
-	wget -O "$@" https://cdn-aws.deb.debian.org/debian/dists/stretch/main/installer-amd64/current/images/netboot/netboot.tar.gz
+	wget -c -O "$@" https://cdn-aws.deb.debian.org/debian/dists/stretch/main/installer-amd64/current/images/netboot/netboot.tar.gz
 	touch "$@"
 
 tmp/tftproot: tmp/netboot.tar.gz