diff --git a/src/od/process/mod.rs b/src/od/process/mod.rs
index 87b6aae9..0c6e3d5b 100644
--- a/src/od/process/mod.rs
+++ b/src/od/process/mod.rs
@@ -466,7 +466,7 @@ where
         info!("Processing {num_msrs} measurements with covariance mapping");
 
         // We'll build a trajectory of the estimated states. This will be used to compute the measurements.
-        let mut traj = Traj::new();
+        let mut traj: Traj<S> = Traj::new();
 
         let mut msr_accepted_cnt = 0;