diff --git a/pkg/morph/client/container/delete.go b/pkg/morph/client/container/delete.go
index c1d346e7..b520120d 100644
--- a/pkg/morph/client/container/delete.go
+++ b/pkg/morph/client/container/delete.go
@@ -67,7 +67,7 @@ func (d *DeletePrm) SetKey(key []byte) {
 //
 // If TryNotary is provided, calls notary contract.
 func (c *Client) Delete(p DeletePrm) error {
-	if len(p.signature) == 0 && p.IsControl() {
+	if len(p.signature) == 0 && !p.IsControl() {
 		return errNilArgument
 	}