diff --git a/src/hdmf_zarr/nwb.py b/src/hdmf_zarr/nwb.py
index 3642937a..2b4d3bfb 100644
--- a/src/hdmf_zarr/nwb.py
+++ b/src/hdmf_zarr/nwb.py
@@ -1,5 +1,4 @@
 """Module with Zarr backend for NWB for integration with PyNWB"""
-from warnings import warn
 from pathlib import Path
 from .backend import ZarrIO, SUPPORTED_ZARR_STORES