diff --git a/lib/model.js b/lib/model.js
index 3a1ccef..cca7af7 100644
--- a/lib/model.js
+++ b/lib/model.js
@@ -113,7 +113,7 @@ function deepCopy (obj) {
     return obj;
   }
 
-  if (obj instanceof Array) {
+  if (util.isArray(obj)) {
     res = [];
     obj.forEach(function (o) { res.push(o); });
     return res;
diff --git a/package.json b/package.json
index 4d92d6d..80a3d4a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "nedb",
-  "version": "0.7.8",
+  "version": "0.7.9",
   "author": {
     "name": "tldr.io",
     "email": "hello@tldr.io"