diff --git a/lib/module.js b/lib/module.js
index f49052bd..6b14d7ae 100644
--- a/lib/module.js
+++ b/lib/module.js
@@ -167,15 +167,19 @@ function registerRendererHook (options) {
        */
       params.HEAD = params.HEAD
         .replace(/<style[^>]*>[.\S\s]*?<\/style>/g, v => v.includes('amp-custom') ? v : '')
+        .replace(/<\/style>[\S\s]*<style[^>]*>/g, '')
+    } else {
+      /**
+       * Merge inline styles
+       */
+      const styleRegex = /<style(?: .+?)?>([\s\S]*?)<\/style>/g
+      const styleList = params.HEAD.match(styleRegex).map((css) => {
+        const rawStyle = css.replace(styleRegex, '$1\n')
+        return rawStyle
+      })
+      params.HEAD = params.HEAD.replace(styleRegex, '') + `<style>${styleList.join('\n')}</style>`
     }
 
-    const styleRegex = /<style(?: .+?)?>([\s\S]*?)<\/style>/g
-    const styleList = params.HEAD.match(styleRegex).map((css) => {
-      const rawStyle = css.replace(styleRegex, '$1\n')
-      return rawStyle
-    })
-    params.HEAD = params.HEAD.replace(styleRegex, '') + `<style>${styleList.join('\n')}</style>`
-
     /**
      * Mark styles as `amp-custom`
      */