diff --git a/files/bird6-troisdorf6.conf b/files/bird6-troisdorf6.conf
index 2ad3a69..0864ac2 100644
--- a/files/bird6-troisdorf6.conf
+++ b/files/bird6-troisdorf6.conf
@@ -44,7 +44,7 @@ return net ~ [ fc00::/7{48,64},
 }
 
 filter hostroute {
-        if net ~  03:2260:121:6000::/52 then accept;
+        if net ~  2a03:2260:121:6000::/52 then accept;
         reject;
 }