diff --git a/matlab/set_parameters.m b/matlab/set_parameters.m
index 3afa3a271..d91484565 100644
--- a/matlab/set_parameters.m
+++ b/matlab/set_parameters.m
@@ -21,8 +21,8 @@ function set_parameters(xparam1)
     for i=1:ncx
       k1 = corrx(i,1);
       k2 = corrx(i,2);
-      Sigma_e(k1,k2) = xparam1(i+offset)*sqrt(Sigma_e_(k1,k1)*Sigma_e_(k2,k2));
-      Sigma_e(k2,k1) = Sigma_e_(k1,k2);
+      Sigma_e(k1,k2) = xparam1(i+offset)*sqrt(Sigma_e(k1,k1)*Sigma_e(k2,k2));
+      Sigma_e(k2,k1) = Sigma_e(k1,k2);
     end
   end