diff --git a/Modules/mathmodule.c b/Modules/mathmodule.c
index 174a231..7c11e6f 100644
--- a/Modules/mathmodule.c
+++ b/Modules/mathmodule.c
@@ -233,7 +233,7 @@
 	{NULL,		NULL}		/* sentinel */
 };
 
-void
+DL_EXPORT(void)
 initmath()
 {
 	PyObject *m, *d, *v;