diff --git a/src/averageinterface.hh b/src/averageinterface.hh
index bc4e2b8c4a5d74963b05e6e911c1eeae9e2ecfdf..824d9f0e83c5bdcae148c3b09548e22b9e19f68c 100644
--- a/src/averageinterface.hh
+++ b/src/averageinterface.hh
@@ -548,6 +548,7 @@ void computeAveragePressureIPOpt(const Dune::FieldVector<double,GridType::dimens
     app->Options()->SetStringValue("mu_strategy", "adaptive");
     app->Options()->SetStringValue("output_file", "ipopt.out");
     app->Options()->SetStringValue("hessian_approximation", "limited-memory");
+    app->Options()->SetStringValue("jac_c_constant", "yes");
     app->Options()->SetIntegerValue("print_level", -2);
 
     // Intialize the IpoptApplication and process the options