diff --git a/uvicorn/protocols/websockets/websockets_impl.py b/uvicorn/protocols/websockets/websockets_impl.py
index 0fe0b7c3d..95875b1e3 100644
--- a/uvicorn/protocols/websockets/websockets_impl.py
+++ b/uvicorn/protocols/websockets/websockets_impl.py
@@ -133,6 +133,7 @@ async def process_request(self, path, headers):
         self.scope = {
             "type": "websocket",
             "asgi": {"version": self.config.asgi_version, "spec_version": "2.1"},
+            "http_version": "1.1",
             "scheme": self.scheme,
             "server": self.server,
             "client": self.client,