diff --git a/packages/ra-ui-materialui/src/button/ExportButton.js b/packages/ra-ui-materialui/src/button/ExportButton.js
index 8ae94536fd0..125bfa11410 100644
--- a/packages/ra-ui-materialui/src/button/ExportButton.js
+++ b/packages/ra-ui-materialui/src/button/ExportButton.js
@@ -37,7 +37,7 @@ const fetchRelatedRecords = dispatch => (data, field, resource) =>
             .map(record => record[field]);
 
         // find unique keys
-        const ids = [...new Set(sanitizedData)];
+        const ids = Array.from(new Set(sanitizedData));
 
         dispatch({
             type: CRUD_GET_MANY,