diff --git a/build/Gruntfile.coffee b/build/Gruntfile.coffee
index 3c2ebf8d2..6ce5d0127 100644
--- a/build/Gruntfile.coffee
+++ b/build/Gruntfile.coffee
@@ -369,6 +369,9 @@ module.exports = (grunt) ->
 
   grunt.registerTask('docs', ['build-docs', 'render-docs'])
 
+  # NOTE: add-nylas-build-resources task has already run during
+  # script/bootstrap
+  #
   buildTasks = [
     'copy-files-for-build',
     'compile',
diff --git a/build/tasks/copy-files-for-build-task.coffee b/build/tasks/copy-files-for-build-task.coffee
index 9ff353e54..a9f005dcf 100644
--- a/build/tasks/copy-files-for-build-task.coffee
+++ b/build/tasks/copy-files-for-build-task.coffee
@@ -1,5 +1,6 @@
 fs = require 'fs'
 path = require 'path'
+rimraf = require 'rimraf'
 _ = require 'underscore'
 
 module.exports = (grunt) ->
@@ -169,6 +170,7 @@ module.exports = (grunt) ->
 
     cp 'spec', path.join(appDir, 'spec')
     cp 'src', path.join(appDir, 'src'), filter: /.+\.(cson|coffee|cjsx|jsx)$/
+    rimraf.sync(path.join(appDir, 'src', 'pro'))
     cp 'static', path.join(appDir, 'static')
     cp 'keymaps', path.join(appDir, 'keymaps')
     cp 'menus', path.join(appDir, 'menus')