diff --git a/minimalkv/net/s3fsstore.py b/minimalkv/net/s3fsstore.py
index c72ad5b..daeed30 100644
--- a/minimalkv/net/s3fsstore.py
+++ b/minimalkv/net/s3fsstore.py
@@ -184,13 +184,11 @@ def _from_parsed_url(
 
         if url_access_key_id is None:
             url_secret_access_key = os.environ.get("AWS_ACCESS_KEY_ID")
-        else:
-            os.environ["AWS_ACCESS_KEY_ID"] = url_access_key_id
+            # TODO: Should we allow these attributes to be none-able?
+            # A potential use case might be a public bucket
 
         if url_secret_access_key is None:
             url_secret_access_key = os.environ.get("AWS_SECRET_ACCESS_KEY")
-        else:
-            os.environ["AWS_SECRET_ACCESS_KEY"] = url_secret_access_key
 
         credentials = Credentials(
             access_key_id=url_access_key_id,