diff --git a/luaApp/src/rec/luaSoft.c b/luaApp/src/rec/luaSoft.c
index d243ff6..f13e9c2 100644
--- a/luaApp/src/rec/luaSoft.c
+++ b/luaApp/src/rec/luaSoft.c
@@ -33,7 +33,7 @@ struct {
 	NULL,
 	NULL,
 	NULL,
-	write_Script
+	(DEVSUPFUN)write_Script
 };
 
 epicsExportAddress(dset,devLuaSoft);