diff --git a/test/test.smartobject.ts b/test/test.smartobject.ts
index 691a059..8df9e7a 100644
--- a/test/test.smartobject.ts
+++ b/test/test.smartobject.ts
@@ -10,6 +10,7 @@ tap.test('should create a smartobject', async () => {
       yeah: 'so deep',
       evendeeper: {
         sodeep: 2,
+        deepArray: ['one array', 'two array']
       }
     }
   }
diff --git a/ts/tools/toFlatObject.ts b/ts/tools/toFlatObject.ts
index b026314..508bf18 100644
--- a/ts/tools/toFlatObject.ts
+++ b/ts/tools/toFlatObject.ts
@@ -4,7 +4,7 @@ export const toFlatObject = (objectArg: object) => {
     if (subObject)
       for (const key of Object.keys(subObject)) {
         let localPathArg = pathArg;
-        if (typeof subObject[ key ] === 'object') {
+        if (typeof subObject[ key ] === 'object' && !(subObject[ key ] instanceof Array)) {
           const newLoopbackArray = loopProtection.slice();
           newLoopbackArray.push(subObject);
           extractLayer(subObject[ key ], localPathArg ? localPathArg += `.${key}` : key, newLoopbackArray);