diff --git a/python-package/xgboost/dask.py b/python-package/xgboost/dask.py
index c6a0d96c5e80..6fa26b657d81 100644
--- a/python-package/xgboost/dask.py
+++ b/python-package/xgboost/dask.py
@@ -272,7 +272,9 @@ def concat(value: Any) -> Any:  # pylint: disable=too-many-return-statements
         from cudf import concat as CUDF_concat  # pylint: disable=import-error
 
         return CUDF_concat(value, axis=0)
-    if lazy_isinstance(value[0], "cupy._core.core", "ndarray"):
+    from .data import _is_cupy_array
+
+    if _is_cupy_array(value[0]):
         import cupy
 
         # pylint: disable=c-extension-no-member,no-member
diff --git a/python-package/xgboost/data.py b/python-package/xgboost/data.py
index 219737e036c5..a9af782db1c0 100644
--- a/python-package/xgboost/data.py
+++ b/python-package/xgboost/data.py
@@ -712,7 +712,6 @@ def _is_cupy_array(data) -> bool:
         for n in ("cupy.core.core", "cupy", "cupy._core.core")
     )
 
-
 def _transform_cupy_array(data):
     import cupy  # pylint: disable=import-error
     if not hasattr(data, '__cuda_array_interface__') and hasattr(