diff --git a/index.d.ts b/index.d.ts
index 93d3a78..6f1a3d6 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,27 +1,27 @@
-declare module 'browserstack-local' {
+declare module "browserstack-local" {
   interface Options {
-    key: string
-    verbose: boolean
-    force: boolean
-    only: string
-    onlyAutomate: boolean
-    forceLocal: boolean
-    localIdentifier: string
-    folder: string
-    proxyHost: string
-    proxyPort: string
-    proxyUser: string
-    proxyPass: string
-    forceProxy: boolean
-    logFile: string
-    parallelRuns: string
-    binarypath: string
-    [key: string]: string | boolean
+    key: string;
+    verbose: boolean;
+    force: boolean;
+    only: string;
+    onlyAutomate: boolean;
+    forceLocal: boolean;
+    localIdentifier: string;
+    folder: string;
+    proxyHost: string;
+    proxyPort: string;
+    proxyUser: string;
+    proxyPass: string;
+    forceProxy: boolean;
+    logFile: string;
+    parallelRuns: string;
+    binarypath: string;
+    [key: string]: string | boolean;
   }
 
   class Local {
-    start(options: Partial<Options>, callback: () => void): void
-    isRunning(): boolean
-    stop(callback: () => void): void
+    start(options: Partial<Options>, callback: (error?: Error) => void): void;
+    isRunning(): boolean;
+    stop(callback: () => void): void;
   }
-}
\ No newline at end of file
+}
diff --git a/package.json b/package.json
index 8161273..ded8400 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "browserstack-local",
-  "version": "1.4.4",
+  "version": "1.4.5",
   "description": "Nodejs bindings for BrowserStack Local",
   "engine": "^0.10.44",
   "main": "index.js",