diff --git a/plugins/mod_storage_internal.lua b/plugins/mod_storage_internal.lua
index d812c0e9d..c21fe0dcb 100644
--- a/plugins/mod_storage_internal.lua
+++ b/plugins/mod_storage_internal.lua
@@ -47,6 +47,12 @@ end
 local archive = {};
 driver.archive = { __index = archive };
 
+archive.caps = {
+	total = true;
+	quota = archive_item_limit;
+	truncate = true;
+};
+
 function archive:append(username, key, value, when, with)
 	when = when or now();
 	if not st.is_stanza(value) then
diff --git a/plugins/mod_storage_sql.lua b/plugins/mod_storage_sql.lua
index 4fe2a262c..82c5c3fe3 100644
--- a/plugins/mod_storage_sql.lua
+++ b/plugins/mod_storage_sql.lua
@@ -232,6 +232,8 @@ end
 local archive_store = {}
 archive_store.caps = {
 	total = true;
+	quota = archive_item_limit;
+	truncate = true;
 };
 archive_store.__index = archive_store
 function archive_store:append(username, key, value, when, with)