diff --git a/_config.yml b/_config.yml
index 908205f..901bf08 100644
--- a/_config.yml
+++ b/_config.yml
@@ -9,7 +9,7 @@ maruku:
     png_dir:    images/latex
     png_url:    /images/latex
 
-gems:
+plugins:
     - jekyll-sitemap
 
 defaults: