diff --git a/src/DynamicModel.hh b/src/DynamicModel.hh
index a718f74741e66823e0af31b78fd82230e2a7b1e3..ed3468f0d34ac553eebc973f4e7a660c6b1c60bd 100644
--- a/src/DynamicModel.hh
+++ b/src/DynamicModel.hh
@@ -886,7 +886,7 @@ DynamicModel::writeParamsDerivativesFile(const string& basename) const
              << "@inbounds begin" << endl
 	     << "T = zeros(" << params_derivs_temporary_terms_idxs.size() << ")"
 	     << endl
-             << tt_output.str()
+
              << "rp = zeros(" << equations.size() << ", "
              << symbol_table.param_nbr() << ");" << endl
              << rp_output.str()