diff --git a/src/pl/plpython/plpython.c b/src/pl/plpython/plpython.c
index b007f4ac6b..2737e5863a 100644
--- a/src/pl/plpython/plpython.c
+++ b/src/pl/plpython/plpython.c
@@ -4026,7 +4026,13 @@ PLy_add_exceptions(PyObject *plpy)
 }
 
 #if PY_MAJOR_VERSION >= 3
-static PyMODINIT_FUNC
+/*
+ * Must have external linkage, because PyMODINIT_FUNC does dllexport on
+ * Windows-like platforms.
+ */
+PyMODINIT_FUNC PyInit_plpy(void);
+
+PyMODINIT_FUNC
 PyInit_plpy(void)
 {
 	PyObject   *m;