diff --git a/lib/migration.js b/lib/migration.js
index 95c57b1d..526d0de6 100644
--- a/lib/migration.js
+++ b/lib/migration.js
@@ -22,10 +22,14 @@ function mixinMigration(PostgreSQL) {
     const userModel = model.registry.getModelByType('User').modelName;
     const modelName = model.modelName;
     const tableName = self.table(modelName);
-    let _foreignKeys = settings.foreignKeys || {};
+    let _foreignKeys = settings.foreignKeys;
 
     Object.defineProperty(settings, 'foreignKeys', {
       get: () => {
+        if (_foreignKeys) {
+          return _foreignKeys;
+        }
+        _foreignKeys = _foreignKeys || {};
         function addForeignKey(keyFrom, modelTo, keyTo) {
           const foreignColumn = self.column(modelName, keyFrom);
           const constraintName = tableName + '_' + foreignColumn + '_fkey';
@@ -71,9 +75,13 @@ function mixinMigration(PostgreSQL) {
       }
     });
 
-    let _indexes = settings.indexes || {};
+    let _indexes = settings.indexes;
     Object.defineProperty(settings, 'indexes', {
       get: () => {
+        if (_indexes) {
+          return _indexes;
+        }
+        _indexes = _indexes || {};
         let fkRefKeys = [];
         for (const rel of Object.values(m.model.relations)) {
           if (rel.type === 'belongsTo') {