diff --git a/tests/test_query_form_action.py b/tests/test_query_form_action.py
index 8eacca8e..8f419d55 100644
--- a/tests/test_query_form_action.py
+++ b/tests/test_query_form_action.py
@@ -33,3 +33,21 @@ async def test_stored_query_form_action_encodes_query_name(ds_client):
     form = Soup(response.text, "html.parser").select_one("form.sql.core")
     assert form is not None
     assert form["action"] == query_url
+
+
+@pytest.mark.asyncio
+async def test_stored_query_form_action_preserves_base_url(
+    app_client_base_url_prefix,
+):
+    query_name = "query with spaces"
+    await app_client_base_url_prefix.ds.update_query(
+        "fixtures", query_name, sql="select 1"
+    )
+    query_url = app_client_base_url_prefix.ds.urls.query("fixtures", query_name)
+
+    response = app_client_base_url_prefix.get(query_url)
+    assert response.status_code == 200
+
+    form = Soup(response.text, "html.parser").select_one("form.sql.core")
+    assert form is not None
+    assert form["action"] == query_url