diff --git a/xnat_ingest/cli/upload.py b/xnat_ingest/cli/upload.py
index 428001a..0282467 100644
--- a/xnat_ingest/cli/upload.py
+++ b/xnat_ingest/cli/upload.py
@@ -130,7 +130,7 @@
     "--temp-dir",
     type=Path,
     default=None,
-    envvar="XNAT_INGEST_UPLOAD_WORKDIR",
+    envvar="XNAT_INGEST_UPLOAD_TEMPDIR",
     help="The directory to use for temporary downloads (i.e. from s3)",
 )
 @click.option(