diff --git a/src/pyexpression/pyexpression.cpp b/src/pyexpression/pyexpression.cpp
index 6fecc65b..2a9c38d3 100644
--- a/src/pyexpression/pyexpression.cpp
+++ b/src/pyexpression/pyexpression.cpp
@@ -9,6 +9,8 @@
 #include "xo/expression/ConstantInterface.hpp"
 #include "xo/expression/Constant.hpp"
 #include "xo/pyutil/pyutil.hpp"
+#include <pybind11/functional.h>
+#include <pybind11/stl.h>
 #include <cmath>
 
 namespace xo {