diff --git a/openedx/core/djangoapps/credentials/utils.py b/openedx/core/djangoapps/credentials/utils.py
index e060cf8fe1..6208fa3cae 100644
--- a/openedx/core/djangoapps/credentials/utils.py
+++ b/openedx/core/djangoapps/credentials/utils.py
@@ -133,7 +133,7 @@ def get_courses_completion_status(lms_user_id, course_run_ids):
         )
         api_response = api_client.post(
             completion_status_url,
-            data={
+            json={
                 'lms_user_id': lms_user_id,
                 'course_runs': course_run_ids,
             }