diff --git a/gtsam.h b/gtsam.h
index 014907037..ba3b7f7c7 100644
--- a/gtsam.h
+++ b/gtsam.h
@@ -1730,7 +1730,7 @@ virtual class SubgraphSolverParameters : gtsam::ConjugateGradientParameters {
 
 virtual class SubgraphSolver  {
   SubgraphSolver(const gtsam::GaussianFactorGraph &A, const gtsam::SubgraphSolverParameters &parameters, const gtsam::Ordering& ordering);
-  SubgraphSolver(const gtsam::GaussianFactorGraph &Ab1, const gtsam::GaussianFactorGraph &Ab2, const gtsam::SubgraphSolverParameters &parameters, const gtsam::Ordering& ordering);
+  SubgraphSolver(const gtsam::GaussianFactorGraph &Ab1, const gtsam::GaussianFactorGraph* Ab2, const gtsam::SubgraphSolverParameters &parameters, const gtsam::Ordering& ordering);
   gtsam::VectorValues optimize() const;
 };