diff --git a/matlab/set_state_space.m b/matlab/set_state_space.m
index 48e32a23a..8655420e7 100644
--- a/matlab/set_state_space.m
+++ b/matlab/set_state_space.m
@@ -43,7 +43,7 @@ nboth = length(both_var);
 npred = length(pred_var);
 nfwrd = length(fwrd_var);
 nstatic = length(stat_var);
-order_var = [ stat_var; pred_var; both_var; fwrd_var];
+order_var = [ stat_var(:); pred_var(:); both_var(:); fwrd_var(:)];
 inv_order_var(order_var) = (1:M_.endo_nbr);
 
 % building kmask for z state vector in t+1