diff --git a/setuptools_golang.py b/setuptools_golang.py
index 2b1b71b..8dddd47 100644
--- a/setuptools_golang.py
+++ b/setuptools_golang.py
@@ -1,6 +1,7 @@
 import argparse
 import contextlib
 import copy
+import errno
 import os
 import shlex
 import shutil
@@ -10,6 +11,8 @@
 import tempfile
 from distutils.ccompiler import CCompiler
 from distutils.dist import Distribution
+from types import TracebackType
+from typing import Any
 from typing import Callable
 from typing import Dict
 from typing import Generator
@@ -22,22 +25,33 @@
 from setuptools.command.build_ext import build_ext as _build_ext
 
 
+def rmtree(path: str) -> None:
+    """Newer golang uses readonly dirs & files for module cache."""
+    def handle_remove_readonly(
+            func: Callable[..., Any],
+            path: str,
+            exc: Tuple[Type[OSError], OSError, TracebackType],
+    ) -> None:
+        excvalue = exc[1]
+        if (
+                func in (os.rmdir, os.remove, os.unlink) and
+                excvalue.errno == errno.EACCES
+        ):
+            for p in (path, os.path.dirname(path)):
+                os.chmod(p, os.stat(p).st_mode | stat.S_IWUSR)
+            func(path)
+        else:
+            raise
+    shutil.rmtree(path, ignore_errors=False, onerror=handle_remove_readonly)
+
+
 @contextlib.contextmanager
 def _tmpdir() -> Generator[str, None, None]:
     tempdir = tempfile.mkdtemp()
     try:
         yield tempdir
     finally:
-        def err(
-                action: Callable[[str], None],
-                name: str,
-                exc: Exception,
-        ) -> None:  # pragma: no cover (windows)
-            """windows: can't remove readonly files, make them writeable!"""
-            os.chmod(name, stat.S_IWRITE)
-            action(name)
-
-        shutil.rmtree(tempdir, onerror=err)
+        rmtree(tempdir)
 
 
 def _get_cflags(
diff --git a/testing/gomodules/go.mod b/testing/gomodules/go.mod
new file mode 100644
index 0000000..a622a41
--- /dev/null
+++ b/testing/gomodules/go.mod
@@ -0,0 +1,5 @@
+module github.com/asottile/setuptools-golang/testing/gomodules
+
+go 1.14
+
+require github.com/golang/example v0.0.0-20170904185048-46695d81d1fa
diff --git a/testing/gomodules/go.sum b/testing/gomodules/go.sum
new file mode 100644
index 0000000..6cb484e
--- /dev/null
+++ b/testing/gomodules/go.sum
@@ -0,0 +1,2 @@
+github.com/golang/example v0.0.0-20170904185048-46695d81d1fa h1:iqCQC2Z53KkwGgTN9szyL4q0OQHmuNjeoNnMT6lk66k=
+github.com/golang/example v0.0.0-20170904185048-46695d81d1fa/go.mod h1:tO/5UvQ/uKigUjQBPqzstj6uxd3fUIjddi19DxGJeWg=
diff --git a/testing/gomodules/reversemsg.go b/testing/gomodules/reversemsg.go
new file mode 100644
index 0000000..8e39a39
--- /dev/null
+++ b/testing/gomodules/reversemsg.go
@@ -0,0 +1,19 @@
+package main
+
+// #include <Python.h>
+import "C"
+
+import (
+	"fmt"
+
+	"github.com/golang/example/stringutil"
+)
+
+//export reversemsg
+func reversemsg() *C.PyObject {
+	fmt.Print(stringutil.Reverse("elpmaxe tset"))
+
+	return C.Py_None
+}
+
+func main() {}
diff --git a/testing/gomodules/reversemsg_support.go b/testing/gomodules/reversemsg_support.go
new file mode 100644
index 0000000..377fd7d
--- /dev/null
+++ b/testing/gomodules/reversemsg_support.go
@@ -0,0 +1,29 @@
+package main
+
+// #include <Python.h>
+//
+// PyObject* reversemsg();
+//
+// static struct PyMethodDef methods[] = {
+//     {"reversemsg", (PyCFunction)reversemsg, METH_NOARGS},
+//     {NULL, NULL}
+// };
+//
+// #if PY_MAJOR_VERSION >= 3
+// static struct PyModuleDef module = {
+//     PyModuleDef_HEAD_INIT,
+//     "gomodules",
+//     NULL,
+//     -1,
+//     methods
+// };
+//
+// PyMODINIT_FUNC PyInit_gomodules(void) {
+//     return PyModule_Create(&module);
+// }
+// #else
+// PyMODINIT_FUNC initgomodules(void) {
+//     Py_InitModule3("gomodules", methods, NULL);
+// }
+// #endif
+import "C"
diff --git a/testing/gomodules/setup.py b/testing/gomodules/setup.py
new file mode 100644
index 0000000..793f3f2
--- /dev/null
+++ b/testing/gomodules/setup.py
@@ -0,0 +1,15 @@
+from setuptools import Extension
+from setuptools import setup
+
+
+setup(
+    name='gomod',
+    ext_modules=[Extension('gomodules', ['reversemsg.go'])],
+    build_golang={
+        'root': 'github.com/asottile/setuptools-golang/testing/gomodules',
+    },
+    # Would do this, but we're testing *our* implementation and this would
+    # install from pypi.  We can rely on setuptools-golang being already
+    # installed under test.
+    # setup_requires=['setuptools-golang'],
+)
diff --git a/tests/setuptools_golang_test.py b/tests/setuptools_golang_test.py
index eacf9a2..36f02c9 100644
--- a/tests/setuptools_golang_test.py
+++ b/tests/setuptools_golang_test.py
@@ -103,6 +103,15 @@ def test_integration_imports_gh(venv):
     assert out == '\x1b[0;31mohai\x1b[0m\n'
 
 
+GOMOD = 'import gomodules; gomodules.reversemsg()'
+
+
+def test_integration_gomodules(venv):
+    run(venv.pip, 'install', os.path.join('testing', 'gomodules'))
+    out = run_output(venv.python, '-c', GOMOD)
+    assert out == 'test example'
+
+
 def test_integration_notfound(venv):
     ret = run(
         venv.pip, 'install', os.path.join('testing', 'notfound'),