diff --git a/debi.sh b/debi.sh
index 8448586..2966032 100755
--- a/debi.sh
+++ b/debi.sh
@@ -815,6 +815,7 @@ EOF
 }
 
 installer_directory="$boot_directory$installer"
+installer_directory=$(grub-mkrelpath $installer_directory)
 
 kernel_params="$kernel_params lowmem/low=1"