diff --git a/Gruntfile.coffee b/Gruntfile.coffee
index bfa9f62..1052893 100644
--- a/Gruntfile.coffee
+++ b/Gruntfile.coffee
@@ -35,7 +35,7 @@ module.exports = (grunt) ->
 
     exec:
       jekyll:
-        cmd: "jekyll build --trace"
+        cmd: "bundle exec jekyll build --trace"
 
     watch:
       options: