diff --git a/matlab/kalman/likelihood/univariate_kalman_filter_d.m b/matlab/kalman/likelihood/univariate_kalman_filter_d.m
index 0211060699d1c8b25f52d48388cd2163ecf5eff6..e6e7c22101d705a3a46a6fb3bd75ac9c664f750d 100644
--- a/matlab/kalman/likelihood/univariate_kalman_filter_d.m
+++ b/matlab/kalman/likelihood/univariate_kalman_filter_d.m
@@ -165,7 +165,7 @@ dlikk = .5*dlikk(1:s);
 llik  = .5*llik(1:s,:);
 
 if presample
-    if presample>=length(dlik)
+    if presample>=length(dlikk)
         dLIK = 0;
         dlikk= [];
         llik = [];