diff --git a/ibis/backends/duckdb/tests/test_client.py b/ibis/backends/duckdb/tests/test_client.py
index 463414e4f484..8477535fbd33 100644
--- a/ibis/backends/duckdb/tests/test_client.py
+++ b/ibis/backends/duckdb/tests/test_client.py
@@ -413,11 +413,10 @@ def test_read_csv_with_types(tmp_path, input, all_varchar):
     assert t.schema()["geom"].is_geospatial()
 
 
-def test_memtable_doesnt_leak(con, monkeypatch):
-    monkeypatch.setattr(ibis.options, "default_backend", con)
-    name = "memtable_doesnt_leak"
+def test_memtable_doesnt_leak(con):
+    name = gen_name("memtable_doesnt_leak")
     assert name not in con.list_tables()
-    df = ibis.memtable({"a": [1, 2, 3]}, name=name).execute()
+    df = con.execute(ibis.memtable({"a": [1, 2, 3]}, name=name))
     assert name not in con.list_tables()
     assert len(df) == 3