diff --git a/lib/mapper/ordination.js b/lib/mapper/ordination.js
index 68dbd15..a558399 100644
--- a/lib/mapper/ordination.js
+++ b/lib/mapper/ordination.js
@@ -16,7 +16,7 @@ function ordination(query, options) {
 
 function processQuery(query) {
     const result = {}
-    query = query.replace(/([^\w\s,-])|(\s{1,})/gi, '')
+    query = query.replace(/([^\w\s,.-])|(\s{1,})/gi, '')
     query.split(',').forEach(function (elem) {
         elem = elem.trim()
         if (elem[0] === '-') result[elem.substr(1)] = -1
diff --git a/package.json b/package.json
index d847549..1303e33 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "query-strings-parser",
-  "version": "2.1.6",
+  "version": "2.1.7",
   "description": "Middleware to transform query strings in a format that is recognized by the MongoDB, MySQL and other databases...",
   "license": "MIT",
   "main": "index.js",
@@ -44,7 +44,7 @@
   "devDependencies": {
     "chai": "^4.2.0",
     "express": "^4.17.1",
-    "mocha": "^8.1.1",
+    "mocha": "^8.1.3",
     "nyc": "^15.1.0",
     "supertest": "^4.0.2"
   }
diff --git a/test/unit/ordination.spec.js b/test/unit/ordination.spec.js
index 2092932..02297e2 100644
--- a/test/unit/ordination.spec.js
+++ b/test/unit/ordination.spec.js
@@ -10,6 +10,14 @@ describe('QueryString: Ordination', function () {
         })
     })
 
+    context('when ordination query is a second-level string', function () {
+        it('should return a JSON with order params', function (done) {
+            const result = ordination.sort({sort: '-user.age'}, default_options)
+            expect(result['user.age']).to.eql(-1)
+            done()
+        })
+    })
+
     context('when ordination query is an array of strings', function () {
         it('should return a JSON with order params', function (done) {
             verify(ordination.sort({sort: ['-name,age', 'created_at']}, default_options))