diff --git a/packages/ra-ui-materialui/src/input/ReferenceArrayInput.tsx b/packages/ra-ui-materialui/src/input/ReferenceArrayInput.tsx
index ba18b763c61..ba434c07cec 100644
--- a/packages/ra-ui-materialui/src/input/ReferenceArrayInput.tsx
+++ b/packages/ra-ui-materialui/src/input/ReferenceArrayInput.tsx
@@ -302,7 +302,7 @@ ReferenceArrayInputView.propTypes = {
     meta: PropTypes.object,
     onChange: PropTypes.func,
     options: PropTypes.object,
-    resource: PropTypes.string.isRequired,
+    resource: PropTypes.string,
     setFilter: PropTypes.func,
     setPagination: PropTypes.func,
     setSort: PropTypes.func,