diff --git a/index.php b/index.php
index 81f0cf7..dea0a49 100644
--- a/index.php
+++ b/index.php
@@ -27,7 +27,7 @@ $next = $sites[$nextIndex];
 ?>
 
 <div class="webring">
-    <a href="<?= htmlspecialchars($prev) ?>">← Previous</a>
+    <a href="//<?= htmlspecialchars($prev) ?>">← Previous</a>
     |
-    <a href="<?= htmlspecialchars($next) ?>">Next →</a>
+    <a href="//<?= htmlspecialchars($next) ?>">Next →</a>
 </div>