diff --git a/src/server/server.ts b/src/server/server.ts
index 2f98db89833..b52db6f517e 100644
--- a/src/server/server.ts
+++ b/src/server/server.ts
@@ -181,18 +181,18 @@ namespace ts.server {
                 this.logger.info("Binding...");
             }
 
-            let args: string[] = [];
+            const args: string[] = [];
             if (this.logger.loggingEnabled() && this.logger.getLogFileName()) {
                 args.push("--logFile", combinePaths(getDirectoryPath(normalizeSlashes(this.logger.getLogFileName())), `ti-${process.pid}.log`));
             }
-            let execArgv: string[] = [];
+            const execArgv: string[] = [];
             {
                 for (const arg of process.execArgv) {
                     const match = /^--(debug|inspect)(=(\d+))?$/.exec(arg);
                     if (match) {
                         // if port is specified - use port + 1
                         // otherwise pick a default port depending on if 'debug' or 'inspect' and use its value + 1 
-                        let currentPort = match[3] !== undefined
+                        const currentPort = match[3] !== undefined
                             ? +match[3]
                             : match[1] === "debug" ? 5858 : 9229;
                         execArgv.push(`--${match[1]}=${currentPort + 1}`);
@@ -200,7 +200,7 @@ namespace ts.server {
                     }
                 }
             }
-            
+
             this.installer = childProcess.fork(combinePaths(__dirname, "typingsInstaller.js"), args, { execArgv });
             this.installer.on("message", m => this.handleMessage(m));
             process.on("exit", () => {