diff --git a/modules/forgefed/star.go b/modules/forgefed/star.go
index a32fb173a6..e0001c7cbb 100644
--- a/modules/forgefed/star.go
+++ b/modules/forgefed/star.go
@@ -52,3 +52,15 @@ func StarNew(id ap.ID, ob ap.ID) *Star {
 func AddStar(ctx *context.APIContext) {
 
 }
+
+func (a Star) MarshalJSON() ([]byte, error) {
+	b := make([]byte, 0)
+	ap.JSONWrite(&b, '{')
+
+	ap.JSONWriteStringProp(&b, "source", string(a.Source))
+	if !ap.JSONWriteActivityValue(&b, a.Activity) {
+		return nil, nil
+	}
+	ap.JSONWrite(&b, '}')
+	return b, nil
+}
diff --git a/modules/forgefed/star_test.go b/modules/forgefed/star_test.go
index e6a7d8311d..04e6373778 100644
--- a/modules/forgefed/star_test.go
+++ b/modules/forgefed/star_test.go
@@ -26,19 +26,12 @@ func Test_StarMarshalJSON(t *testing.T) {
 			item: Star{
 				Source: "forgejo",
 				Activity: ap.Activity{
-					ID:   "https://repo.prod.meissa.de/api/activitypub/user-id/1",
-					Type: "Star",
-					Object: ap.Object{
-						ID: "https://codeberg.org/api/activitypub/repository-id/1",
-					},
+					Actor:  ap.IRI("https://repo.prod.meissa.de/api/activitypub/user-id/1"),
+					Type:   "Star",
+					Object: ap.IRI("https://codeberg.org/api/activitypub/repository-id/1"),
 				},
 			},
-			want: []byte(`{
-			"type": "Star",
-			"source": "forgejo",
-			"actor": "https://repo.prod.meissa.de/api/activitypub/user-id/1",
-			"object": "https://codeberg.org/api/activitypub/repository-id/1"
-		  }`),
+			want: []byte(`{"source":"forgejo","type":"Star","actor":"https://repo.prod.meissa.de/api/activitypub/user-id/1","object":"https://codeberg.org/api/activitypub/repository-id/1"}`),
 		},
 	}