--- a/mmdebstrap
+++ b/mmdebstrap
@@ -4453,7 +4453,7 @@ sub approx_disk_usage {
     find({ wanted => $scan_installed_size, no_chdir => 1 }, $directory);
 
     # because the above is only a heuristic we add 10% extra for good measure
-    return int($installed_size * 1.1);
+    return int($installed_size * 1.2);
 }
 
 sub main() {