diff --git a/.gitpod.yml b/.gitpod.yml
new file mode 100644
index 00000000..1112c89a
--- /dev/null
+++ b/.gitpod.yml
@@ -0,0 +1,10 @@
+# This configuration file was automatically generated by Gitpod.
+# Please adjust to your needs (see https://www.gitpod.io/docs/introduction/learn-gitpod/gitpod-yaml)
+# and commit this file to your remote git repository to share the goodness with others.
+
+# Learn more from ready-to-use templates: https://www.gitpod.io/docs/introduction/getting-started/quickstart
+
+tasks:
+  - init: python -m pip install --upgrade -r requirements-test.txt && go get && go build ./... && go test ./...
+
+
diff --git a/sign/sign.go b/sign/sign.go
index e31b5465..aa6d958c 100644
--- a/sign/sign.go
+++ b/sign/sign.go
@@ -69,7 +69,7 @@ func Marshal(v interface{}, keys ...keys.Signer) (*data.Signed, error) {
 	if err != nil {
 		return nil, err
 	}
-	s := &data.Signed{Signed: b}
+	s := &data.Signed{Signed: b, Signatures: make([]data.Signature, 0)}
 	for _, k := range keys {
 		if err := Sign(s, k); err != nil {
 			return nil, err