diff --git a/src/widgets/relation/RelationControl.js b/src/widgets/relation/RelationControl.js
index 71c58d85..73580ef0 100644
--- a/src/widgets/relation/RelationControl.js
+++ b/src/widgets/relation/RelationControl.js
@@ -9,7 +9,7 @@ import { FixedSizeList } from 'react-window';
 import { SortableContainer, SortableElement, SortableHandle } from 'react-sortable-hoc';
 
 import { reactSelectStyles } from '../../ui';
-import { stringTemplate, validations } from '../../lib/widgets';
+import { stringTemplate } from '../../lib/widgets';
 
 function arrayMove(array, from, to) {
   const slicedArray = array.slice();
diff --git a/src/widgets/relation/index.js b/src/widgets/relation/index.js
index b44ef634..6b4a8a32 100644
--- a/src/widgets/relation/index.js
+++ b/src/widgets/relation/index.js
@@ -1,6 +1,11 @@
 import controlComponent from './RelationControl';
 import previewComponent from './RelationPreview';
 import schema from './schema';
+import { validations } from '../../lib/widgets';
+
+function isMultiple(field) {
+  return field.get('multiple', false);
+}
 
 function Widget(opts = {}) {
   return {
@@ -11,7 +16,7 @@ function Widget(opts = {}) {
       const min = field.get('min');
       const max = field.get('max');
 
-      if (!this.isMultiple()) {
+      if (!isMultiple(field)) {
         return { error: false };
       }