diff --git a/internal/osbuild/rpm_ostree_stage.go b/internal/osbuild/rpm_ostree_stage.go
new file mode 100644
index 000000000..b5a961441
--- /dev/null
+++ b/internal/osbuild/rpm_ostree_stage.go
@@ -0,0 +1,16 @@
+package osbuild
+
+// The RPM-OSTree stage describes how to transform the imgae into an OSTree.
+type RPMOSTreeStageOptions struct {
+	EtcGroupMembers []string `json:"etc_group_members,omitempty"`
+}
+
+func (RPMOSTreeStageOptions) isStageOptions() {}
+
+// NewLocaleStage creates a new Locale Stage object.
+func NewRPMOSTreeStage(options *RPMOSTreeStageOptions) *Stage {
+	return &Stage{
+		Name:    "org.osbuild.rpm-ostree",
+		Options: options,
+	}
+}
diff --git a/internal/osbuild/stage.go b/internal/osbuild/stage.go
index 54b42415a..dd2689585 100644
--- a/internal/osbuild/stage.go
+++ b/internal/osbuild/stage.go
@@ -62,6 +62,8 @@ func (stage *Stage) UnmarshalJSON(data []byte) error {
 		options = new(FirewallStageOptions)
 	case "org.osbuild.rpm":
 		options = new(RPMStageOptions)
+	case "org.osbuild.rpm-ostree":
+		options = new(RPMOSTreeStageOptions)
 	case "org.osbuild.systemd":
 		options = new(SystemdStageOptions)
 	case "org.osbuild.script":
diff --git a/internal/osbuild/stage_test.go b/internal/osbuild/stage_test.go
index 21663cd25..8e3651ca4 100644
--- a/internal/osbuild/stage_test.go
+++ b/internal/osbuild/stage_test.go
@@ -195,6 +195,20 @@ func TestStage_UnmarshalJSON(t *testing.T) {
 				data: []byte(`{"name":"org.osbuild.rpm","options":{"gpgkeys":["key1","key2"],"packages":["checksum1","checksum2"]}}`),
 			},
 		},
+		{
+			name: "rpm-ostree",
+			fields: fields{
+				Name: "org.osbuild.rpm-ostree",
+				Options: &RPMOSTreeStageOptions{
+					EtcGroupMembers: []string{
+						"wheel",
+					},
+				},
+			},
+			args: args{
+				data: []byte(`{"name":"org.osbuild.rpm-ostree","options":{"etc_group_members":["wheel"]}}`),
+			},
+		},
 		{
 			name: "script",
 			fields: fields{