diff --git a/libs/ardour/lua_api.cc b/libs/ardour/lua_api.cc
index e0153d06ee..99a9b1b493 100644
--- a/libs/ardour/lua_api.cc
+++ b/libs/ardour/lua_api.cc
@@ -37,7 +37,7 @@ boost::shared_ptr<Processor>
 ARDOUR::LuaAPI::new_luaproc (Session *s, const string& name)
 {
 	if (!s) {
-		return boost::shared_ptr<Processor> (0);
+		return boost::shared_ptr<Processor> ();
 	}
 
 	LuaScriptInfoPtr spi;