diff --git a/lib/tags.js b/lib/tags.js
index ff03453a..d752c760 100644
--- a/lib/tags.js
+++ b/lib/tags.js
@@ -152,7 +152,10 @@ function getNecessaryScripts (tags, cdnBase = 'https://cdn.ampproject.org/v0/',
   const detectedTags = Object.keys(tags)
     .filter(tag => filterTag(html, tag, tags[tag]))
     .map(tag => generateScript(cdnBase, tag, tags[tag]))
-  return detectedTags.join('')
+
+  const distinctDetectedTags = [...new Set(detectedTags)]
+
+  return distinctDetectedTags.join('')
 }
 
 module.exports = {