diff --git a/src/sandbox/mod.rs b/src/sandbox/mod.rs
index 1cccd1d..1dad459 100644
--- a/src/sandbox/mod.rs
+++ b/src/sandbox/mod.rs
@@ -327,14 +327,16 @@ impl Sandbox {
 
     fn remove_net(&mut self, net_id: NetId) -> Option<NetInfo> {
         if let Some((net, rename)) = self.nets.remove(net_id.0) {
-            // Rename all the references to the net that was moved into this position.
-            let renamed = self.nets.get(rename.dest).unwrap();
-            for wire_id in &renamed.wires {
-                self.wires.get_mut(wire_id.0).unwrap().net_id = NetId(rename.dest);
-            }
-            //TODO remove this clone, reduce size of get_peg_mut borrow
-            for peg_id in &renamed.pegs.clone() {
-                self.get_peg_mut(peg_id).unwrap().net_id = NetId(rename.dest);
+            if rename.src != rename.dest {
+                // Rename all the references to the net that was moved into this position.
+                let renamed = self.nets.get(rename.dest).unwrap();
+                for wire_id in &renamed.wires {
+                    self.wires.get_mut(wire_id.0).unwrap().net_id = NetId(rename.dest);
+                }
+                //TODO remove this clone, reduce size of get_peg_mut borrow
+                for peg_id in &renamed.pegs.clone() {
+                    self.get_peg_mut(peg_id).unwrap().net_id = NetId(rename.dest);
+                }
             }
 
             // Perform the same swap-remove in net_states: