diff --git a/fuse_optimizers/src/fixed_lag_smoother.cpp b/fuse_optimizers/src/fixed_lag_smoother.cpp
index 87de2e8fe..a49a674fc 100644
--- a/fuse_optimizers/src/fixed_lag_smoother.cpp
+++ b/fuse_optimizers/src/fixed_lag_smoother.cpp
@@ -416,7 +416,7 @@ void FixedLagSmoother::processQueue(
           << lag_expiration.nanoseconds() << ". The queued transaction with timestamp "
           << element.stamp().nanoseconds() << " from sensor " << element.sensor_name
           << " has a minimum involved timestamp of " << min_stamp.nanoseconds() << ", which is "
-          << (lag_expiration - min_stamp).nanoseconds()
+          << (lag_expiration - min_stamp).seconds()
           << " seconds too old. Ignoring this transaction.");
       transaction_riter = erase(pending_transactions_, transaction_riter);
     } else if (  // NOLINT
@@ -442,7 +442,7 @@ void FixedLagSmoother::processQueue(
           "The queued transaction with timestamp "
             << element.stamp().nanoseconds() << " and maximum involved stamp of "
             << max_stamp.nanoseconds() << " from sensor " << element.sensor_name
-            << " could not be processed after " << (current_time - max_stamp).nanoseconds()
+            << " could not be processed after " << (current_time - max_stamp).seconds()
             << " seconds, which is greater than the 'transaction_timeout' value of "
             << params_.transaction_timeout.nanoseconds() << ". Ignoring this transaction.");
         transaction_riter = erase(pending_transactions_, transaction_riter);