diff --git a/test/acceptance/stats/mapnik_stats_layergroup.js b/test/acceptance/stats/mapnik_stats_layergroup.js
index 1f8ca067..55ca7a64 100644
--- a/test/acceptance/stats/mapnik_stats_layergroup.js
+++ b/test/acceptance/stats/mapnik_stats_layergroup.js
@@ -585,17 +585,17 @@ describe(`[${desc}] Create mapnik layergroup`, function() {
 
     it('should not provide a sample when the source table is empty', function (done) {
         var testClient = new TestClient({
-            "version": "1.4.0",
-            "layers": [
+            version: "1.4.0",
+            layers: [
                 {
-                    "type": "mapnik",
-                    "options": {
-                        "sql": "SELECT * FROM test_table_100 limit 0",
-                        "cartocss_version": "2.3.0",
-                        "cartocss": "#layer { line-width:16; }",
-                        "metadata": {
-                            "sample": {
-                                "num_rows": 30
+                    type: "mapnik",
+                    options: {
+                        sql: "SELECT * FROM test_table_100 limit 0",
+                        cartocss_version: "2.3.0",
+                        cartocss: "#layer { line-width:16; }",
+                        metadata: {
+                            sample: {
+                                num_rows: 30
                             }
                         }
                     }