diff --git a/gtsam/nonlinear/ExpressionFactorGraph.h b/gtsam/nonlinear/ExpressionFactorGraph.h
index 122bd429f..665f887e2 100644
--- a/gtsam/nonlinear/ExpressionFactorGraph.h
+++ b/gtsam/nonlinear/ExpressionFactorGraph.h
@@ -42,7 +42,8 @@ public:
   template<typename T>
   void addExpressionFactor(const Expression<T>& h, const T& z,
       const SharedNoiseModel& R) {
-    push_back(boost::make_shared<ExpressionFactor<T> >(R, z, h));
+    using F = ExpressionFactor<T>;
+    push_back(boost::allocate_shared<F>(Eigen::aligned_allocator<F>(), R, z, h));
   }
 
   /// @}