diff --git a/demo/server.js b/demo/server.js
index c04c48ea..c0d5e1f6 100644
--- a/demo/server.js
+++ b/demo/server.js
@@ -43,15 +43,15 @@ function startServer() {
     const env = Object.assign({}, process.env);
     env['COLORTERM'] = 'truecolor';
     var cols = parseInt(req.query.cols),
-        rows = parseInt(req.query.rows),
-        term = pty.spawn(process.platform === 'win32' ? 'cmd.exe' : 'bash', [], {
-          name: 'xterm-256color',
-          cols: cols || 80,
-          rows: rows || 24,
-          cwd: env.PWD,
-          env: env,
-          encoding: USE_BINARY ? null : 'utf8'
-        });
+      rows = parseInt(req.query.rows),
+      term = pty.spawn(process.platform === 'win32' ? 'cmd.exe' : 'bash', [], {
+        name: 'xterm-256color',
+        cols: cols || 80,
+        rows: rows || 24,
+        cwd: process.platform === 'win32' ? undefined : env.PWD,
+        env: env,
+        encoding: USE_BINARY ? null : 'utf8'
+      });
 
     console.log('Created terminal with PID: ' + term.pid);
     terminals[term.pid] = term;
diff --git a/src/browser/ColorManager.ts b/src/browser/ColorManager.ts
index 9a0fd7ee..b6950d28 100644
--- a/src/browser/ColorManager.ts
+++ b/src/browser/ColorManager.ts
@@ -17,9 +17,8 @@ const DEFAULT_SELECTION = {
   rgba: 0xFFFFFF4D
 };
 
-// An IIFE to generate DEFAULT_ANSI_COLORS. Do not mutate DEFAULT_ANSI_COLORS, instead make a copy
-// and mutate that.
-export const DEFAULT_ANSI_COLORS = (() => {
+// An IIFE to generate DEFAULT_ANSI_COLORS.
+export const DEFAULT_ANSI_COLORS = Object.freeze((() => {
   const colors = [
     // dark:
     css.toColor('#2e3436'),
@@ -64,7 +63,7 @@ export const DEFAULT_ANSI_COLORS = (() => {
   }
 
   return colors;
-})();
+})());
 
 /**
  * Manages the source of truth for a terminal's colors.