diff --git a/tests/asyncio/test_sanity.py b/tests/asyncio/test_sanity.py
index 0d1d0f9..e77e63f 100644
--- a/tests/asyncio/test_sanity.py
+++ b/tests/asyncio/test_sanity.py
@@ -203,6 +203,7 @@ async def test_http2_websocket() -> None:
         stream_id,
         [
             (":method", "CONNECT"),
+            (":protocol", "websocket"),
             (":path", "/"),
             (":authority", "hypercorn"),
             (":scheme", "https"),
diff --git a/tests/trio/test_sanity.py b/tests/trio/test_sanity.py
index 98387a2..42d7b39 100644
--- a/tests/trio/test_sanity.py
+++ b/tests/trio/test_sanity.py
@@ -175,6 +175,7 @@ async def test_http2_websocket(nursery: trio._core._run.Nursery) -> None:
         stream_id,
         [
             (":method", "CONNECT"),
+            (":protocol", "websocket"),
             (":path", "/"),
             (":authority", "hypercorn"),
             (":scheme", "https"),