diff --git a/matlab/evaluate_smoother.m b/matlab/evaluate_smoother.m
index a828f5cf0..ddf65acfe 100644
--- a/matlab/evaluate_smoother.m
+++ b/matlab/evaluate_smoother.m
@@ -1,4 +1,4 @@
-function oo = evaluate_smoother(parameters,var_list)
+function evaluate_smoother(parameters,var_list)
 % Evaluate the smoother at parameters.
 %
 % INPUTS