diff --git a/instld/common_utils/convert_options.py b/instld/common_utils/convert_options.py
index b564a67..9be328f 100644
--- a/instld/common_utils/convert_options.py
+++ b/instld/common_utils/convert_options.py
@@ -61,6 +61,7 @@ def add_to_buffer(key, *value, is_option=True):
             '--require-hashes',
             '--no-clean',
             '--no-index',
+            '--isolated',
         )
 
         if key in string_variants: