diff --git a/nonlinear/NonlinearOptimization.h b/nonlinear/NonlinearOptimization.h
index 7c6c8c04b..4312760f1 100644
--- a/nonlinear/NonlinearOptimization.h
+++ b/nonlinear/NonlinearOptimization.h
@@ -46,7 +46,7 @@ namespace gtsam {
 	 */
 	template<class G, class T>
 	T optimize(const G& graph, const T& initialEstimate, const NonlinearOptimizationParameters& parameters = NonlinearOptimizationParameters(),
-			const enum LinearSolver& solver = SEQUENTIAL);
+			const enum LinearSolver& solver = MULTIFRONTAL);
 
 }