diff --git a/uno/ingredients/inequality_handling_methods/interior_point_methods/PrimalDualInteriorPointMethod.cpp b/uno/ingredients/inequality_handling_methods/interior_point_methods/PrimalDualInteriorPointMethod.cpp
index 4e62dc21..eb0dc264 100644
--- a/uno/ingredients/inequality_handling_methods/interior_point_methods/PrimalDualInteriorPointMethod.cpp
+++ b/uno/ingredients/inequality_handling_methods/interior_point_methods/PrimalDualInteriorPointMethod.cpp
@@ -212,7 +212,8 @@ namespace uno {
 
       // check the inertia
       [[maybe_unused]] auto [number_pos_eigenvalues, number_neg_eigenvalues, number_zero_eigenvalues] = this->linear_solver->get_inertia();
-      assert(number_pos_eigenvalues == number_variables && number_neg_eigenvalues == number_constraints && number_zero_eigenvalues == 0);
+      assert(number_pos_eigenvalues == problem.number_variables && number_neg_eigenvalues == problem.number_constraints &&
+         number_zero_eigenvalues == 0);
 
       // rhs
       this->assemble_augmented_rhs(current_multipliers, problem.number_variables, problem.number_constraints);
diff --git a/uno/ingredients/subproblem_solvers/BQPD/BQPDSolver.cpp b/uno/ingredients/subproblem_solvers/BQPD/BQPDSolver.cpp
index 970243d6..aa7c3f78 100644
--- a/uno/ingredients/subproblem_solvers/BQPD/BQPDSolver.cpp
+++ b/uno/ingredients/subproblem_solvers/BQPD/BQPDSolver.cpp
@@ -45,7 +45,7 @@ namespace uno {
    // preallocate a bunch of stuff
    BQPDSolver::BQPDSolver(size_t number_variables, size_t number_constraints, size_t number_objective_gradient_nonzeros, size_t number_jacobian_nonzeros,
          size_t number_hessian_nonzeros, BQPDProblemType problem_type, const Options& options):
-         QPSolver(), number_hessian_nonzeros(number_hessian_nonzeros),
+         QPSolver(),
          lower_bounds(number_variables + number_constraints),
          upper_bounds(number_variables + number_constraints),
          constraints(number_constraints),
diff --git a/uno/ingredients/subproblem_solvers/BQPD/BQPDSolver.hpp b/uno/ingredients/subproblem_solvers/BQPD/BQPDSolver.hpp
index 85cd6a1a..74e87d6f 100644
--- a/uno/ingredients/subproblem_solvers/BQPD/BQPDSolver.hpp
+++ b/uno/ingredients/subproblem_solvers/BQPD/BQPDSolver.hpp
@@ -61,8 +61,6 @@ namespace uno {
       [[nodiscard]] double hessian_quadratic_product(const Vector<double>& primal_direction) const override;
 
    private:
-      const size_t number_hessian_nonzeros;
-
       std::vector<double> lower_bounds{}, upper_bounds{}; // lower and upper bounds of variables and constraints
       std::vector<double> constraints;
       SparseVector<double> linear_objective;