diff --git a/dask_cuda/disk_io.py b/dask_cuda/disk_io.py
index a17b6fd77..ac1e68c5b 100644
--- a/dask_cuda/disk_io.py
+++ b/dask_cuda/disk_io.py
@@ -204,7 +204,7 @@ def disk_read(header: Mapping, gds=False) -> list:
     frames: list
         List of read frames
     """
-    ret = []
+    ret: list = []
     if gds:
         import kvikio  # isort:skip