diff --git a/mixing/mixclient/client.go b/mixing/mixclient/client.go
index 4a0756701..b1a3239c0 100644
--- a/mixing/mixclient/client.go
+++ b/mixing/mixclient/client.go
@@ -739,6 +739,8 @@ func (c *Client) Dicemix(ctx context.Context, rand io.Reader, cj *CoinJoin) erro
 	case <-c.warming:
 	case <-ctx.Done():
 		return ctx.Err()
+	default:
+		return ErrWarming
 	}
 
 	pub, priv, err := generateSecp256k1(rand)
diff --git a/mixing/mixclient/errors.go b/mixing/mixclient/errors.go
index 20fe58d50..a53cb7c58 100644
--- a/mixing/mixclient/errors.go
+++ b/mixing/mixclient/errors.go
@@ -6,6 +6,8 @@ var (
 	ErrTooFewPeers = errors.New("not enough peers required to mix")
 
 	ErrUnknownPRs = errors.New("unable to participate in reformed session referencing unknown PRs")
+
+	ErrWarming = errors.New("mixing client is observing messages; retry request later")
 )
 
 // testPeerBlamedError describes the error condition of a misbehaving peer