diff --git a/matlab/evaluate_steady_state_file.m b/matlab/evaluate_steady_state_file.m
index 1d8ff198d..8a218e743 100644
--- a/matlab/evaluate_steady_state_file.m
+++ b/matlab/evaluate_steady_state_file.m
@@ -59,9 +59,9 @@ function [ys,params,info] = evaluate_steady_state_file(ys_init,exo_ss,M,options)
         info(2) = NaN;
     end
     
-    updated_params_flag = max(abs(params1-params)) > 1e-12;
+    updated_params_flag = max(abs(params1-params)) > 1e-12 || ~isequal(isnan(params1),isnan(params)); %checks whether numbers or NaN changed
 
-    if  isnan(updated_params_flag) || (updated_params_flag  && ~isempty(find(isnan(params1))))
+    if  isnan(updated_params_flag) || (updated_params_flag  && any(isnan(params(~isnan(params))-params1(~isnan(params))))) %checks if new NaNs were added
         info(1) = 24;
         info(2) = NaN;
         return