diff --git a/client-side/forms/netteForms.js b/client-side/forms/netteForms.js
index 65657b1c88..c616b4052d 100644
--- a/client-side/forms/netteForms.js
+++ b/client-side/forms/netteForms.js
@@ -128,6 +128,7 @@ Nette.validateRule = function(elem, op, arg) {
 		op = op.substr(1);
 	}
 	op = op.replace('::', '_');
+  op = op.replace('\\', '');
 	return Nette.validators[op] ? Nette.validators[op](elem, arg, val) : null;
 };