diff --git a/vendor/github.com/containers/image/signature/mechanism.go b/vendor/github.com/containers/image/signature/mechanism.go
index 196ad927..9b1b47ff 100644
--- a/vendor/github.com/containers/image/signature/mechanism.go
+++ b/vendor/github.com/containers/image/signature/mechanism.go
@@ -76,6 +76,9 @@ func (m gpgSigningMechanism) ImportKeysFromBytes(blob []byte) ([]string, error)
 func (m gpgSigningMechanism) Sign(input []byte, keyIdentity string) ([]byte, error) {
 	key, err := m.ctx.GetKey(keyIdentity, true)
 	if err != nil {
+		if e, ok := err.(gpgme.Error); ok && e.Code() == gpgme.ErrorEOF {
+			return nil, fmt.Errorf("key %q not found", keyIdentity)
+		}
 		return nil, err
 	}
 	inputData, err := gpgme.NewDataBytes(input)