diff --git a/modules/luci-base/htdocs/luci-static/resources/validation.js b/modules/luci-base/htdocs/luci-static/resources/validation.js
index 70d3a7e73a..fccce4ab0b 100644
--- a/modules/luci-base/htdocs/luci-static/resources/validation.js
+++ b/modules/luci-base/htdocs/luci-static/resources/validation.js
@@ -575,6 +575,18 @@ var ValidatorFactory = baseclass.extend({
 
 		string: function() {
 			return true;
+		},
+
+		directory: function() {
+			return true;
+		},
+
+		file: function() {
+			return true;
+		},
+
+		device: function() {
+			return true;
 		}
 	}
 });