diff --git a/Min_annulus_d/include/CGAL/Min_annulus_d.h b/Min_annulus_d/include/CGAL/Min_annulus_d.h
index a00d9b80b97..56e398f22c4 100644
--- a/Min_annulus_d/include/CGAL/Min_annulus_d.h
+++ b/Min_annulus_d/include/CGAL/Min_annulus_d.h
@@ -647,7 +647,6 @@ private:
     strategy = pricing_strategy(NT());
     delete solver;
     solver = new Solver(lp, strategy);
-    CGAL_optimisation_assertion(solver->is_valid());
     CGAL_optimisation_assertion(solver->status() == QP_OPTIMAL);
  
     // compute center and squared radius