diff --git a/demo/client.ts b/demo/client.ts
index 08545c09d5..4af03548b6 100644
--- a/demo/client.ts
+++ b/demo/client.ts
@@ -100,7 +100,7 @@ function createTerminal(): void {
   addDomListener(actionElements.findNext, 'keypress', (e) => {
     if (e.key === 'Enter') {
       e.preventDefault();
-      let searchOptions = {
+      const searchOptions = {
         regex: (document.getElementById('regex') as HTMLInputElement).checked,
         wholeWord: false,
         caseSensitive: false
@@ -111,7 +111,7 @@ function createTerminal(): void {
   addDomListener(actionElements.findPrevious, 'keypress', (e) => {
     if (e.key === 'Enter') {
       e.preventDefault();
-      let searchOptions = {
+      const searchOptions = {
         regex: (document.getElementById('regex') as HTMLInputElement).checked,
         wholeWord: false,
         caseSensitive: false
diff --git a/package.json b/package.json
index f2591d0383..468c027eda 100644
--- a/package.json
+++ b/package.json
@@ -50,7 +50,7 @@
   "scripts": {
     "start": "node demo/start",
     "start-zmodem": "node demo/zmodem/app",
-    "lint": "tslint 'src/**/*.ts'",
+    "lint": "tslint 'src/**/*.ts' './demo/**/*.ts'",
     "test": "npm-run-all mocha lint",
     "test-debug": "node --inspect-brk node_modules/.bin/gulp test",
     "test-suite": "gulp mocha-suite --test",