diff --git a/src-ts/tools/gamification-admin/pages/badge-detail/manual-assign-badge.store.ts b/src-ts/tools/gamification-admin/pages/badge-detail/manual-assign-badge.store.ts
index ae0cbc545..c575e7b97 100644
--- a/src-ts/tools/gamification-admin/pages/badge-detail/manual-assign-badge.store.ts
+++ b/src-ts/tools/gamification-admin/pages/badge-detail/manual-assign-badge.store.ts
@@ -9,5 +9,9 @@ export async function submitRequestAsync(csv: string): Promise<any> {
     // fill the form
     form.append('file', new Blob([csv], { type: 'text/csv' }), 'data.csv')
 
-    return xhrPostAsync(url, form)
+    return xhrPostAsync(url, form, {
+        headers: {
+            'Content-Type': 'multipart/form-data',
+        },
+    })
 }