diff --git a/Modules/md5module.c b/Modules/md5module.c
index e82d339..2508f52 100644
--- a/Modules/md5module.c
+++ b/Modules/md5module.c
@@ -267,7 +267,7 @@
 
 /* Initialize this module. */
 
-void
+DL_EXPORT(void)
 initmd5()
 {
 	PyObject *m, *d;