diff --git a/python/gtsam/preamble/basis.h b/python/gtsam/preamble/basis.h
index 56a07cfdd..d07a75f6f 100644
--- a/python/gtsam/preamble/basis.h
+++ b/python/gtsam/preamble/basis.h
@@ -10,5 +10,3 @@
  * 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>
diff --git a/python/gtsam/preamble/discrete.h b/python/gtsam/preamble/discrete.h
index 608508c32..598ab626d 100644
--- a/python/gtsam/preamble/discrete.h
+++ b/python/gtsam/preamble/discrete.h
@@ -11,6 +11,4 @@
  * mutations on Python side will not be reflected on C++.
  */
 
-#include <pybind11/stl.h>
-
 PYBIND11_MAKE_OPAQUE(gtsam::DiscreteKeys);
diff --git a/python/gtsam/preamble/inference.h b/python/gtsam/preamble/inference.h
index 320e0ac71..bd71c0817 100644
--- a/python/gtsam/preamble/inference.h
+++ b/python/gtsam/preamble/inference.h
@@ -11,5 +11,3 @@
  * mutations on Python side will not be reflected on C++.
  */
 
-#include <pybind11/stl.h>
-