diff --git a/package.json b/package.json
index 44cc2e88..5c7574ee 100644
--- a/package.json
+++ b/package.json
@@ -8,6 +8,7 @@
   "license": "MIT",
   "devDependencies": {
     "@types/chai": "^3.4.34",
+    "@types/glob": "^5.0.35",
     "@types/jsdom": "^11.0.1",
     "@types/mocha": "^2.2.33",
     "@types/node": "6.0.108",
diff --git a/src/utils/TestUtils.test.ts b/src/utils/TestUtils.test.ts
index e3ae89d3..42c4d974 100644
--- a/src/utils/TestUtils.test.ts
+++ b/src/utils/TestUtils.test.ts
@@ -267,7 +267,7 @@ export class MockInputHandlingTerminal implements IInputHandlingTerminal {
     throw new Error('Method not implemented.');
   }
   setOption(key: string, value: any): void {
-    this.options[key] = value;
+    (<any>this.options)[key] = value;
   }
   on(type: string, listener: XtermListener): void {
     throw new Error('Method not implemented.');