diff --git a/helpers/make-grub-installer b/helpers/make-grub-installer
index d9a3163..1b0840c 100644
--- a/helpers/make-grub-installer
+++ b/helpers/make-grub-installer
@@ -18,6 +18,8 @@
 #
 
 VERSION=1
+EXTERNAL='deb-src http://ftp.debian.org/debian stable main'
+REPOKEY=648ACFD622F3D138
 
 . ./config