diff --git a/index.js b/index.js
index 62044a4..0cadf78 100644
--- a/index.js
+++ b/index.js
@@ -50,7 +50,7 @@ var blacklistFilter = function (part) { return blacklist.indexOf(part) === -1 }
 
 function parsePath (path, sep) {
   if (path.indexOf('[') >= 0) {
-    path = path.replace(/\[/g, '.').replace(/]/g, '')
+    path = path.replace(/\[/g, sep).replace(/]/g, '')
   }
 
   var parts = path.split(sep)
diff --git a/src/dot-object.js b/src/dot-object.js
index 6a3a0e5..1129746 100644
--- a/src/dot-object.js
+++ b/src/dot-object.js
@@ -50,7 +50,7 @@ var blacklistFilter = function (part) { return blacklist.indexOf(part) === -1 }
 
 function parsePath (path, sep) {
   if (path.indexOf('[') >= 0) {
-    path = path.replace(/\[/g, '.').replace(/]/g, '')
+    path = path.replace(/\[/g, sep).replace(/]/g, '')
   }
 
   var parts = path.split(sep)
diff --git a/test/dot-json.js b/test/dot-json.js
index edfafb1..84f28c0 100644
--- a/test/dot-json.js
+++ b/test/dot-json.js
@@ -55,6 +55,28 @@ describe('Object test:', function () {
     })
   })
 
+  it('Should expand dotted keys with array notation with different separator', function () {
+    var row = {
+      id: 2,
+      my_arr_0: 'one',
+      my_arr_1: 'two',
+      my_arr_2: 'three',
+      'my_arr2[0]': 'one',
+      'my_arr2[1]': 'two',
+      'my_arr2[2]': 'three'
+    }
+
+    new Dot('_').object(row)
+
+    row.should.eql({
+      id: 2,
+      my: {
+        arr: ['one', 'two', 'three'],
+        arr2: ['one', 'two', 'three']
+      }
+    })
+  })
+
   it('Should allow keys with numbers', function () {
     var row = {
       id: 2,