1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/rest/synapse/client/pick_idp.py b/synapse/rest/synapse/client/pick_idp.py
index e5b720bbca..9550b82998 100644
--- a/synapse/rest/synapse/client/pick_idp.py
+++ b/synapse/rest/synapse/client/pick_idp.py
@@ -45,7 +45,9 @@ class PickIdpResource(DirectServeHtmlResource):
         self._server_name = hs.hostname
 
     async def _async_render_GET(self, request: SynapseRequest) -> None:
-        client_redirect_url = parse_string(request, "redirectUrl", required=True)
+        client_redirect_url = parse_string(
+            request, "redirectUrl", required=True, encoding="utf-8"
+        )
         idp = parse_string(request, "idp", required=False)
 
         # if we need to pick an IdP, do so