diff --git a/python-package/xgboost/data.py b/python-package/xgboost/data.py
index b57a935e8be9..5d1e2d41d742 100644
--- a/python-package/xgboost/data.py
+++ b/python-package/xgboost/data.py
@@ -436,7 +436,7 @@ def _is_dlpack(data):
 
 def _transform_dlpack(data):
     from cupy import fromDlpack  # pylint: disable=E0401
-    assert 'used_dltenso' not in str(data)
+    assert 'used_dltensor' not in str(data)
     data = fromDlpack(data)
     return data