diff --git a/_includes/pack.html b/_includes/pack.html
index d9b0937..a4519f0 100644
--- a/_includes/pack.html
+++ b/_includes/pack.html
@@ -1 +1 @@
-<script defer src="{{ jekyll.production | ternary: site.data.assets['assets/js/pack.js'], 'assets/js/pack.js' }}"></script>
+<script defer src="{{ jekyll.environment | equals: 'production' | ternary: site.data.assets['assets/js/pack.js'], 'assets/js/pack.js' }}"></script>