diff --git a/python/mrc/_pymrc/tests/test_asyncio_runnable.cpp b/python/mrc/_pymrc/tests/test_asyncio_runnable.cpp
index 18ef222bc..e20715c4e 100644
--- a/python/mrc/_pymrc/tests/test_asyncio_runnable.cpp
+++ b/python/mrc/_pymrc/tests/test_asyncio_runnable.cpp
@@ -36,7 +36,6 @@
 #include <gtest/gtest.h>
 #include <pybind11/pybind11.h>
 #include <pybind11/pytypes.h>
-#include <pybind11/stl.h>
 #include <rxcpp/rx.hpp>
 
 #include <atomic>