diff --git a/build/tasks/spec-task.coffee b/build/tasks/spec-task.coffee
index 896c96856..442943fd3 100644
--- a/build/tasks/spec-task.coffee
+++ b/build/tasks/spec-task.coffee
@@ -94,7 +94,7 @@ module.exports = (grunt) ->
         opts:
           env: _.extend({}, process.env,
             ATOM_INTEGRATION_TESTS_ENABLED: true
-            PATH: [process.env.path, chromedriverPath].join(":")
+            PATH: [process.env.path, chromedriverPath].join(path.delimiter)
           )
 
     else if process.platform is 'win32'