diff --git a/reCTBN/src/tools.rs b/reCTBN/src/tools.rs
index ecfeff9..47a067d 100644
--- a/reCTBN/src/tools.rs
+++ b/reCTBN/src/tools.rs
@@ -5,6 +5,7 @@ use ndarray::prelude::*;
 use crate::sampling::{ForwardSampler, Sampler};
 use crate::{params, process};
 
+#[derive(Clone)]
 pub struct Trajectory {
     time: Array1<f64>,
     events: Array2<usize>,
@@ -29,6 +30,7 @@ impl Trajectory {
     }
 }
 
+#[derive(Clone)]
 pub struct Dataset {
     trajectories: Vec<Trajectory>,
 }