diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/rule_actions/legacy_saved_object_mappings.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/rule_actions/legacy_saved_object_mappings.ts
index 3d6a405225fe..4a1cbf00c9ad 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/rule_actions/legacy_saved_object_mappings.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/rule_actions/legacy_saved_object_mappings.ts
@@ -61,7 +61,7 @@ const legacyRuleActionsSavedObjectMappings: SavedObjectsType['mappings'] = {
 export const legacyType: SavedObjectsType = {
   name: legacyRuleActionsSavedObjectType,
   hidden: false,
-  namespaceType: 'single',
+  namespaceType: 'multiple-isolated',
   mappings: legacyRuleActionsSavedObjectMappings,
   migrations: legacyRuleActionsSavedObjectMigration,
 };