diff --git a/event/subscription.go b/event/subscription.go
index d03f465075..26efbf994b 100644
--- a/event/subscription.go
+++ b/event/subscription.go
@@ -143,7 +143,7 @@ func (s *resubscribeSub) loop() {
 }
 
 func (s *resubscribeSub) subscribe() Subscription {
-	subscribed := make(chan error)
+	subscribed := make(chan error, 1)
 	var sub Subscription
 retry:
 	for {
diff --git a/p2p/simulations/adapters/exec.go b/p2p/simulations/adapters/exec.go
index 7c6ec94621..18ec9c69b8 100644
--- a/p2p/simulations/adapters/exec.go
+++ b/p2p/simulations/adapters/exec.go
@@ -287,7 +287,7 @@ func (n *ExecNode) Stop() error {
 	if err := n.Cmd.Process.Signal(syscall.SIGTERM); err != nil {
 		return n.Cmd.Process.Kill()
 	}
-	waitErr := make(chan error)
+	waitErr := make(chan error, 1)
 	go func() {
 		waitErr <- n.Cmd.Wait()
 	}()