diff --git a/Modules/binascii.c b/Modules/binascii.c
index 26e4b6c..73dc27a 100644
--- a/Modules/binascii.c
+++ b/Modules/binascii.c
@@ -742,7 +742,7 @@
 /* Initialization function for the module (*must* be called initbinascii) */
 static char doc_binascii[] = "Conversion between binary data and ASCII";
 
-void
+DL_EXPORT(void)
 initbinascii()
 {
 	PyObject *m, *d, *x;