diff --git a/src/md/trajectory/traj.rs b/src/md/trajectory/traj.rs
index 7ca06ce6..f0140467 100644
--- a/src/md/trajectory/traj.rs
+++ b/src/md/trajectory/traj.rs
@@ -644,7 +644,7 @@ where
             format!("{}", self.states[0].frame()),
         )]);
 
-        let mut cfg = cfg.clone();
+        let mut cfg = cfg;
 
         let mut fields = match cfg.fields {
             Some(fields) => fields,