diff --git a/matlab/prior_sampler.m b/matlab/prior_sampler.m
index 19c252bd1..fecd806ac 100644
--- a/matlab/prior_sampler.m
+++ b/matlab/prior_sampler.m
@@ -47,6 +47,8 @@ count_dll_problem = 0;
 count_complex_jacobian = 0;
 count_complex_steadystate = 0;
 count_nan_steadystate = 0;
+count_nan_params = 0;
+count_complex_params = 0;
 count_unknown_problem = 0;
 NumberOfSimulations = options_.prior_mc;
 NumberOfParameters = length(bayestopt_.p1);