diff --git a/gtsam/nonlinear/NonlinearFactor.cpp b/gtsam/nonlinear/NonlinearFactor.cpp
index 3d572e970..debff54ac 100644
--- a/gtsam/nonlinear/NonlinearFactor.cpp
+++ b/gtsam/nonlinear/NonlinearFactor.cpp
@@ -167,8 +167,9 @@ boost::shared_ptr<GaussianFactor> NoiseModelFactor::linearize(
     return GaussianFactor::shared_ptr(
         new JacobianFactor(terms, b,
             boost::static_pointer_cast<Constrained>(noiseModel_)->unit()));
-  else
+  else {
     return GaussianFactor::shared_ptr(new JacobianFactor(terms, b));
+  }
 }
 
 /* ************************************************************************* */
diff --git a/python/gtsam/preamble/nonlinear.h b/python/gtsam/preamble/nonlinear.h
index d07a75f6f..56a07cfdd 100644
--- a/python/gtsam/preamble/nonlinear.h
+++ b/python/gtsam/preamble/nonlinear.h
@@ -10,3 +10,5 @@
  * Without this they will be automatically converted to a Python object, and all
  * mutations on Python side will not be reflected on C++.
  */
+
+#include <pybind11/stl.h>