1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/http/proxyagent.py b/synapse/http/proxyagent.py

index 6fd88bde20..a16dde2380 100644
--- a/synapse/http/proxyagent.py
+++ b/synapse/http/proxyagent.py
@@ -41,7 +41,7 @@ from synapse.types import ISynapseReactor
 
 logger = logging.getLogger(__name__)
 
-_VALID_URI = re.compile(br"\A[\x21-\x7e]+\Z")
+_VALID_URI = re.compile(rb"\A[\x21-\x7e]+\Z")
 
 
 @implementer(IAgent)