diff --git a/lg.py b/lg.py
index 6a9f4e7..40caa95 100644
--- a/lg.py
+++ b/lg.py
@@ -575,7 +575,11 @@ def build_as_tree_from_raw_bird_ouput(host, proto, text):
                 net_dest = expr2.group(1).strip()
 
         if line.startswith("BGP.as_path:"):
-            path.extend(line.replace("BGP.as_path:", "").strip().split(" "))
+            ASes = line.replace("BGP.as_path:", "").strip().split(" ")
+            if path:
+                path.extend(ASes)
+            else:
+                path = ASes
     
     if path:
         path.append(net_dest)