diff --git a/packages/kg-default-atoms/lib/atoms/index.js b/packages/kg-default-atoms/lib/atoms/index.js
index 98508df9d..630d0a975 100644
--- a/packages/kg-default-atoms/lib/atoms/index.js
+++ b/packages/kg-default-atoms/lib/atoms/index.js
@@ -1,3 +1,5 @@
-var softReturn = require('./soft-return');
+'use strict';
+
+const softReturn = require('./soft-return');
 
 module.exports = [softReturn];
diff --git a/packages/kg-default-atoms/lib/atoms/soft-return.js b/packages/kg-default-atoms/lib/atoms/soft-return.js
index 384194008..74ee4bdd9 100644
--- a/packages/kg-default-atoms/lib/atoms/soft-return.js
+++ b/packages/kg-default-atoms/lib/atoms/soft-return.js
@@ -1,3 +1,5 @@
+'use strict';
+
 module.exports = {
     name: 'soft-return',
     type: 'dom',