diff --git a/swarm/network/simulation/simulation.go b/swarm/network/simulation/simulation.go
index 2045029b02..aa01f736fe 100644
--- a/swarm/network/simulation/simulation.go
+++ b/swarm/network/simulation/simulation.go
@@ -161,6 +161,14 @@ var maxParallelCleanups = 10
 // simulation.
 func (s *Simulation) Close() {
 	close(s.done)
+	// Close all connections before calling the Network Shutdown.
+	// It is possible that p2p.Server.Stop will block if there are
+	// existing connections.
+	for _, c := range s.Net.Conns {
+		if c.Up {
+			s.Net.Disconnect(c.One, c.Other)
+		}
+	}
 	sem := make(chan struct{}, maxParallelCleanups)
 	s.mu.RLock()
 	cleanupFuncs := make([]func(), len(s.cleanupFuncs))
@@ -190,14 +198,6 @@ func (s *Simulation) Close() {
 		close(s.runC)
 	}
 	s.shutdownWG.Wait()
-	// Close all connections before calling the Network Shutdown.
-	// It is possible that p2p.Server.Stop will block if there are
-	// existing connections.
-	for _, c := range s.Net.Conns {
-		if c.Up {
-			s.Net.Disconnect(c.One, c.Other)
-		}
-	}
 	s.Net.Shutdown()
 }