diff --git a/matlab/default_option_values.m b/matlab/default_option_values.m
index cbdec9e3c06bca2d16eca63574c0f9905b837f8d..68f7e31dff56f93ebf9597376ffe7acd60fefe66 100644
--- a/matlab/default_option_values.m
+++ b/matlab/default_option_values.m
@@ -69,7 +69,7 @@ options_.mode_check.nolik = false;
 options_.huge_number = 1e7;
 
 % Default number of threads for parallelized mex files.
-options_.threads.kronecker.sparse_hessian_times_B_kronecker_C = 1;
+options_.threads.kronecker.sparse_hessian_times_B_kronecker_C = num_procs;
 options_.threads.local_state_space_iteration_2 = 1;
 
 % steady state