diff --git a/lib/command_line.js b/lib/command_line.js
index f48acc1f..4e0a89d7 100644
--- a/lib/command_line.js
+++ b/lib/command_line.js
@@ -126,7 +126,7 @@
   watch_scripts = function watch_scripts() {
     var _a, _b, _c, _d, source, watch;
     watch = function watch(source) {
-      return process.watchFile(source, {
+      return fs.watchFile(source, {
         persistent: true,
         interval: 500
       }, function(curr, prev) {