diff --git a/tests/integration/test_restapi_integration.py b/tests/integration/test_restapi_integration.py
index 8013ab9..7d41fcc 100644
--- a/tests/integration/test_restapi_integration.py
+++ b/tests/integration/test_restapi_integration.py
@@ -2520,30 +2520,6 @@ def test_join_via_sqlalchemy(self, d1_engine, joined_tables):
 
         assert rows == [(1, "x", 7)]
 
-    @pytest.mark.asyncio
-    async def test_join_via_async_sqlalchemy(self, joined_tables):
-        """Keep duplicate columns through the real async engine and adapter."""
-        from sqlalchemy import text
-        from sqlalchemy.ext.asyncio import create_async_engine
-
-        table_a, table_b = joined_tables
-        url = f"cloudflare_d1+async://{ACCOUNT_ID}:{API_TOKEN}@{DATABASE_ID}"
-        engine = create_async_engine(url)
-
-        try:
-            async with engine.connect() as conn:
-                result = await conn.execute(
-                    text(
-                        f"/* note */ SELECT {table_a}.id, {table_a}.name, "
-                        f"{table_b}.id FROM {table_a} JOIN {table_b} "
-                        f"ON {table_b}.a_id = {table_a}.id"
-                    )
-                )
-                assert list(result.keys()) == ["id", "name", "id"]
-                assert result.fetchall() == [(1, "x", 7)]
-        finally:
-            await engine.dispose()
-
 
 # MARK: - Autoincrement Insert Tests (Issue #12)
 
diff --git a/tests/unit/test_connection.py b/tests/unit/test_connection.py
index dcf7826..7c9d6ac 100644
--- a/tests/unit/test_connection.py
+++ b/tests/unit/test_connection.py
@@ -10,7 +10,6 @@
 import httpx
 import pytest
 from sqlalchemy import create_engine, event, text
-from sqlalchemy.ext.asyncio import create_async_engine
 
 from sqlalchemy_cloudflare_d1.connection import AsyncConnection, Connection
 
@@ -93,27 +92,5 @@ def use_fake_raw(dbapi_connection, connection_record):
     assert rows == [(1, "x", 7)]
 
 
-def test_async_engine_keeps_values_of_columns_with_same_name():
-    """Keep positional values through the async SQLAlchemy adapter, too."""
-    engine = create_async_engine("cloudflare_d1+async://acct:token@db")
-
-    @event.listens_for(engine.sync_engine, "connect")
-    def use_fake_raw(dbapi_connection, connection_record):
-        dbapi_connection._connection.client = httpx.AsyncClient(
-            transport=raw_transport(["id", "name", "id"], [[1, "x", 7]])
-        )
-
-    async def main():
-        try:
-            async with engine.connect() as conn:
-                result = await conn.execute(text("/* note */ " + JOIN_SQL))
-                assert list(result.keys()) == ["id", "name", "id"]
-                assert result.fetchall() == [(1, "x", 7)]
-        finally:
-            await engine.dispose()
-
-    asyncio.run(main())
-
-
 if __name__ == "__main__":
     pytest.main([__file__])