diff --git a/scripts/build/binary_iso b/scripts/build/binary_iso
index 9e6257308..0c4404511 100755
--- a/scripts/build/binary_iso
+++ b/scripts/build/binary_iso
@@ -173,7 +173,7 @@ input_dir=/usr/lib/grub/i386-pc
 
 # build core.img
 core_img=\$(mktemp)
-grub-mkimage -d \${input_dir} -o \${core_img} -O i386-pc biosdisk iso9660
+grub-mkimage -d \${input_dir} -o \${core_img} -O i386-pc --prefix=/boot/grub biosdisk iso9660
 
 # build grub_eltorito image
 cat \${input_dir}/cdboot.img \${core_img} > binary/boot/grub/grub_eltorito