diff --git a/benchmark/server b/benchmark/server
index 667ebcb..f32bcf1 100755
--- a/benchmark/server
+++ b/benchmark/server
@@ -19,11 +19,11 @@ let app = express();
 
 app.use(logger("dev"));
 app.use(express.static(__dirname));
-app.use("/examples", express.static(__dirname + "/../examples"));
+app.use("/examples", express.static(`${__dirname}/../examples`));
 
 app.get("/bundle.js", (req, res) => {
-  let files = glob.sync(__dirname + "/**/*.js", {
-    ignore: __dirname + "/vendor/**/*"
+  let files = glob.sync(`${__dirname}/**/*.js`, {
+    ignore: `${__dirname}/vendor/**/*`
   });
 
   browserify(files)
diff --git a/spec/server b/spec/server
index 57cd0d1..23186e8 100755
--- a/spec/server
+++ b/spec/server
@@ -21,8 +21,8 @@ app.use(logger("dev"));
 app.use(express.static(__dirname));
 
 app.get("/bundle.js", (req, res) => {
-  let files = glob.sync(__dirname + "/**/*.js", {
-    ignore: __dirname + "/vendor/**/*"
+  let files = glob.sync(`${__dirname}/**/*.js`, {
+    ignore: `${__dirname}/vendor/**/*`
   });
 
   browserify(files)