diff --git a/umap/tests/test_datalayer_views.py b/umap/tests/test_datalayer_views.py
index d88bdd69..01fd5c64 100644
--- a/umap/tests/test_datalayer_views.py
+++ b/umap/tests/test_datalayer_views.py
@@ -28,6 +28,7 @@ def test_get(client, settings, datalayer):
         assert response['ETag'] is not None
     assert response['Last-Modified'] is not None
     assert response['Cache-Control'] is not None
+    assert response['Vary'] == 'Accept-Encoding'
     assert 'Content-Encoding' not in response
     j = json.loads(response.content.decode())
     assert '_umap_options' in j
diff --git a/umap/views.py b/umap/views.py
index 55f307fe..8ab823d2 100644
--- a/umap/views.py
+++ b/umap/views.py
@@ -744,6 +744,7 @@ class DataLayerView(GZipMixin, BaseDetailView):
             response["Last-Modified"] = http_date(statobj.st_mtime)
             response['ETag'] = '"%s"' % hashlib.md5(force_bytes(response.content)).hexdigest()  # noqa
             response['Content-Length'] = len(response.content)
+            response['Vary'] = 'Accept-Encoding'
         if path.endswith(self.EXT):
             response['Content-Encoding'] = 'gzip'
         return response