diff --git a/data_navigator.go b/data_navigator.go
index 1d2e6e1d..e6db1a34 100644
--- a/data_navigator.go
+++ b/data_navigator.go
@@ -82,6 +82,9 @@ func writeArray(context interface{}, paths []string, value interface{}) []interf
 	if err != nil {
 		die("Error accessing array: %v", err)
 	}
+	for index >= int64(len(array)) {
+		array = append(array, nil)
+	}
 	currentChild := array[index]
 
 	log.Debugf("\tcurrentChild %v\n", currentChild)
diff --git a/data_navigator_test.go b/data_navigator_test.go
index 1ec64038..ba54fc4c 100644
--- a/data_navigator_test.go
+++ b/data_navigator_test.go
@@ -205,6 +205,21 @@ b:
 	assertResult(t, "4", readMap(updated, "b", []string{"d", "0"}))
 }
 
+func TestWrite_add_to_array(t *testing.T) {
+  var data = parseData(`
+b:
+  - aa
+`)
+
+  var expected = `b:
+- aa
+- bb`
+
+  updated := writeMap(data, []string{"b", "1"}, "bb")
+
+  assertResult(t, expected, yamlToString(updated))
+}
+
 func TestWrite_with_no_tail(t *testing.T) {
 	var data = parseData(`
 b: