diff --git a/tests/unit/test_testing/test_sub_client/demo.py b/tests/unit/test_testing/test_sub_client/demo.py
index 7a14dea65e..dce3de56cb 100644
--- a/tests/unit/test_testing/test_sub_client/demo.py
+++ b/tests/unit/test_testing/test_sub_client/demo.py
@@ -11,7 +11,7 @@
 
 @get("/notify/{topic:str}")
 async def get_notified(topic: str) -> ServerSentEvent:
-    async def generator() -> AsyncIterator[bytes]:
+    async def generator() -> AsyncIterator[str]:
         yield topic
         while True:
             await asyncio.sleep(0.1)
diff --git a/tests/unit/test_testing/test_sub_client/test_subprocess_client.py b/tests/unit/test_testing/test_sub_client/test_subprocess_client.py
index ff3784fef8..4096ee1a61 100644
--- a/tests/unit/test_testing/test_sub_client/test_subprocess_client.py
+++ b/tests/unit/test_testing/test_sub_client/test_subprocess_client.py
@@ -43,7 +43,7 @@ async def test_subprocess_async_client(async_client: httpx.AsyncClient) -> None:
             break
 
 
-def test_subprocess_sync_client(sync_client: httpx.AsyncClient) -> None:
+def test_subprocess_sync_client(sync_client: httpx.Client) -> None:
     """Demonstrates functionality of the async client with an infinite SSE source that cannot be tested with the
     regular async test client.
     """