1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/app/frontend_proxy.py b/synapse/app/frontend_proxy.py
index de889357c3..b349e3e3ce 100644
--- a/synapse/app/frontend_proxy.py
+++ b/synapse/app/frontend_proxy.py
@@ -90,7 +90,7 @@ class KeyUploadServlet(RestServlet):
             # They're actually trying to upload something, proxy to main synapse.
             # Pass through the auth headers, if any, in case the access token
             # is there.
-            auth_headers = request.requestHeaders.getRawHeaders("Authorization", [])
+            auth_headers = request.requestHeaders.getRawHeaders(b"Authorization", [])
             headers = {
                 "Authorization": auth_headers,
             }