diff --git a/bgpsim/src/builder.rs b/bgpsim/src/builder.rs
index 7633071..cdb6189 100644
--- a/bgpsim/src/builder.rs
+++ b/bgpsim/src/builder.rs
@@ -819,7 +819,7 @@ impl<P: Prefix, Q: EventQueue<P>, Ospf: OspfImpl> NetworkBuilder<P, Q, Ospf>
         // build a local LUT
         let lut: HashMap<RouterId, GaoRexfordPeerType> = self
             .external_indices()
-            .map(|ext| (ext, peer_type(ext, &self, &mut rng, a.clone())))
+            .map(|ext| (ext, peer_type(ext, self, &mut rng, a.clone())))
             .collect();
 
         _build_gao_rexford(self, lut)