diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 6ad729aae7..897fb665c1 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -149,7 +149,7 @@ set(PYBIND11_TEST_FILES
     test_sequences_and_iterators
     test_smart_ptr
     test_stl
-    test_stl_binders
+    test_stl_binders.py
     test_tagbased_polymorphic
     test_thread
     test_type_caster_pyobject_ptr
@@ -220,6 +220,7 @@ tests_extra_targets("test_exceptions.py;test_local_bindings.py;test_stl.py;test_
 # And add additional targets for other tests.
 tests_extra_targets("test_exceptions.py" "cross_module_interleaved_error_already_set")
 tests_extra_targets("test_gil_scoped.py" "cross_module_gil_utils")
+tests_extra_targets("test_stl_binders.py" "stl_binders")
 
 set(PYBIND11_EIGEN_REPO
     "https://gitlab.com/libeigen/eigen.git"
diff --git a/tests/test_stl_binders.cpp b/tests/stl_binders.cpp
similarity index 99%
rename from tests/test_stl_binders.cpp
rename to tests/stl_binders.cpp
index e52a03b6d2..39f142b0b3 100644
--- a/tests/test_stl_binders.cpp
+++ b/tests/stl_binders.cpp
@@ -10,13 +10,13 @@
 #include <pybind11/numpy.h>
 #include <pybind11/stl_bind.h>
 
-#include "pybind11_tests.h"
-
 #include <deque>
 #include <map>
 #include <unordered_map>
 #include <vector>
 
+namespace py = pybind11;
+
 class El {
 public:
     El() = delete;
@@ -174,7 +174,7 @@ struct recursive_container_traits<MutuallyRecursiveContainerPairVM, SFINAE> {
 } // namespace detail
 } // namespace pybind11
 
-TEST_SUBMODULE(stl_binders, m) {
+PYBIND11_MODULE(stl_binders, m) {
     // test_vector_int
     py::bind_vector<std::vector<unsigned int>>(m, "VectorInt", py::buffer_protocol());
 
diff --git a/tests/test_stl_binders.py b/tests/test_stl_binders.py
index c00d45b926..9c8e89f8a7 100644
--- a/tests/test_stl_binders.py
+++ b/tests/test_stl_binders.py
@@ -1,6 +1,5 @@
 import pytest
-
-from pybind11_tests import stl_binders as m
+import stl_binders as m
 
 
 def test_vector_int():