diff --git a/README.md b/README.md
index d8d7e82..896c83f 100644
--- a/README.md
+++ b/README.md
@@ -296,7 +296,7 @@ These elements provide information for how a document should be perceived, and r
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 - 📖 [Facebook Open Graph Markup](https://developers.facebook.com/docs/sharing/webmasters#markup)
-- 📖 [Open Graph protocol](https://ogp.me/)
+- 📖 [Open Graph protocol](http://ogp.me/)
 - 🛠 Test your page with the [Facebook Sharing Debugger](https://developers.facebook.com/tools/debug/)
 
 ### Twitter Card