diff --git a/lib/charms/opensearch/v0/opensearch_relation_peer_cluster.py b/lib/charms/opensearch/v0/opensearch_relation_peer_cluster.py
index 3f68d828f..6f74f4229 100644
--- a/lib/charms/opensearch/v0/opensearch_relation_peer_cluster.py
+++ b/lib/charms/opensearch/v0/opensearch_relation_peer_cluster.py
@@ -595,7 +595,11 @@ def _grant_rel_data_secrets(
 
             for rel_id in all_rel_ids:
                 if relation := self.get_rel(rel_id=rel_id):
-                    self.secrets.grant_secret_to_relation(secret_id, relation)
+                    if key == "s3":
+                        self.secrets.grant_secret_to_relation(secret_id["access_key"], relation)
+                        self.secrets.grant_secret_to_relation(secret_id["secret_key"], relation)
+                    else:
+                        self.secrets.grant_secret_to_relation(secret_id, relation)
 
 
 class OpenSearchPeerClusterRequirer(OpenSearchPeerClusterRelation):