diff --git a/packages/form-builder/addon/validators/jexl.js b/packages/form-builder/addon/validators/jexl.js
index d1f0d75ee..4a354b50a 100644
--- a/packages/form-builder/addon/validators/jexl.js
+++ b/packages/form-builder/addon/validators/jexl.js
@@ -13,6 +13,7 @@ const TRANSFORMS = [
   "avg",
   "stringify",
   "flatten",
+  "length",
 ];
 const BINARY_OPS = ["intersects"];