diff --git a/_includes/env.html b/_includes/env.html
deleted file mode 100644
index 245978b..0000000
--- a/_includes/env.html
+++ /dev/null
@@ -1,7 +0,0 @@
-<script async type="text/javascript">
-  window.env = {
-    AIRBRAKE_PROJECT_ID: {{ site.env.AIRBRAKE_PROJECT_ID }},
-    AIRBRAKE_PROJECT_KEY: '{{ site.env.AIRBRAKE_PROJECT_KEY }}',
-    JEKYLL_ENV: '{{ site.env.JEKYLL_ENV }}'
-  }
-</script>
diff --git a/_layouts/default.html b/_layouts/default.html
index ba67055..f942cd8 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -16,7 +16,8 @@
     desarrollo hay que evitar el archivo .env (copiarlo de .env.example
     si no existe.
     {% endcomment %}
-    {%- include_cached env.html -%}
+    <link rel="preload" as="script" type="text/javascript" href="env.js" />
+    <script type="text/javascript" src="env.js"></script>
     <script defer type="text/javascript" src="assets/js/pack.js"></script>
 
     {% comment %}
diff --git a/env.js b/env.js
new file mode 100644
index 0000000..6210493
--- /dev/null
+++ b/env.js
@@ -0,0 +1,8 @@
+---
+---
+
+window.env = {
+  AIRBRAKE_PROJECT_ID: {{ site.env.AIRBRAKE_PROJECT_ID | default: 0 }},
+  AIRBRAKE_PROJECT_KEY: '{{ site.env.AIRBRAKE_PROJECT_KEY }}',
+  JEKYLL_ENV: '{{ site.env.JEKYLL_ENV }}'
+}