diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 876522b..f9f6284 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -2899,7 +2899,7 @@
 #endif
 #endif
 
-void
+DL_EXPORT(void)
 INITFUNC()
 {
 	PyObject *m, *d, *v;