diff --git a/lib/solvers/MspConnectionPairSolver/getConnectivityMapFromInputProblem.ts b/lib/solvers/MspConnectionPairSolver/getConnectivityMapFromInputProblem.ts
index d3a098c3..52aacd01 100644
--- a/lib/solvers/MspConnectionPairSolver/getConnectivityMapFromInputProblem.ts
+++ b/lib/solvers/MspConnectionPairSolver/getConnectivityMapFromInputProblem.ts
@@ -14,7 +14,7 @@ export const getConnectivityMapsFromInputProblem = (
     ])
   }
 
-  const netConnMap = new ConnectivityMap(directConnMap.netMap)
+  const netConnMap = new ConnectivityMap({...directConnMap.netMap})
 
   for (const netConn of inputProblem.netConnections) {
     netConnMap.addConnections([[netConn.netId, ...netConn.pinIds]])