diff --git a/lib/homebridge/provider.js b/lib/homebridge/provider.js
index 22f5d42..0a936f7 100644
--- a/lib/homebridge/provider.js
+++ b/lib/homebridge/provider.js
@@ -6,7 +6,7 @@ import { HOMEBRIDGE_VERSION } from '../homebridge';
 // This class represents a HomeBridge Provider that may or may not be installed.
 export class Provider {
   
-  constructor(name) {
+  constructor(name:string) {
     this.name = name;
   }
   
@@ -59,9 +59,9 @@ export class Provider {
   static installed():Array<Provider> {
 
     let providers:Array<Provider> = [];
-    let names = fs.readdirSync(Provider.installedProvidersDir);
+    let names:Array<string> = fs.readdirSync(Provider.installedProvidersDir);
     
-    for (let name of names) {
+    for (let name:string of names) {
 
       // reconstruct full path
       let fullPath:string = path.join(Provider.installedProvidersDir, name);