diff --git a/index.py b/index.py
index 788b4de..dc021b6 100644
--- a/index.py
+++ b/index.py
@@ -79,7 +79,7 @@ for host in sites:
             
             if href and href != '/':
                 p = to_absolute(href, host)
-                if p and p.netloc == main.netloc:
+                if p and p.netloc == main.netloc and p.geturl() not in visited:
                     queue.insert(0, p)