diff --git a/src/DynamicModel.hh b/src/DynamicModel.hh
index d857a9eb92d2bb61ee036164ef83194238ccfeaf..81cadf950ff6fd1ff6b8c68f7c6ee9243a2bee9e 100644
--- a/src/DynamicModel.hh
+++ b/src/DynamicModel.hh
@@ -962,7 +962,7 @@ DynamicModel::writeParamsDerivativesFile(const string &basename) const
     paramsDerivsFile << "# NB: this file was automatically generated by Dynare" << endl
                      << "#     from " << basename << ".mod" << endl
                      << "#" << endl
-                     << "function dynamic_params_derivs(y, x, paramssteady_state, it_,"
+                     << "function dynamic_params_derivs(y, x, params, steady_state, it_,"
                      << "ss_param_deriv, ss_param_2nd_deriv)" << endl
 		     << "@inbounds begin" << endl
                      << tt_output.str()