diff --git a/src/lib.rs b/src/lib.rs
index 2a23d64..536bdad 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -24,7 +24,7 @@ use uuid::Uuid;
 #[derive(Debug, Serialize, Deserialize, Clone, JsonSchema, PartialEq)]
 #[serde(rename_all = "camelCase")]
 /// Data Type "ProductFootprint" of Tech Spec Version 2
-pub struct ProductFootprint<T: JsonSchema> {
+pub struct ProductFootprint<T: JsonSchema + Clone> {
     pub id: PfId,
     pub spec_version: SpecVersionString,
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -448,7 +448,7 @@ pub enum AssuranceBoundary {
 
 #[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
 #[serde(rename_all = "camelCase")]
-pub struct DataModelExtension<T: JsonSchema> {
+pub struct DataModelExtension<T: JsonSchema + Clone> {
     pub spec_version: SpecVersionString,
     pub data_schema: String, // Replace String with URL
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -890,7 +890,7 @@ impl JsonSchema for PfId {
     }
 }
 
-impl<T: JsonSchema> JsonSchema for DataModelExtension<T> {
+impl<T: JsonSchema + Clone> JsonSchema for DataModelExtension<T> {
     fn schema_name() -> String {
         "DataModelExtension".into()
     }