1 files changed, 7 insertions, 3 deletions
diff --git a/synapse/http/matrixfederationclient.py b/synapse/http/matrixfederationclient.py
index 18f6a8fd29..58aed5fd96 100644
--- a/synapse/http/matrixfederationclient.py
+++ b/synapse/http/matrixfederationclient.py
@@ -562,13 +562,17 @@ class MatrixFederationHttpClient(object):
         Returns:
             list[bytes]: a list of headers to be added as "Authorization:" headers
         """
-        request = {"method": method, "uri": url_bytes, "origin": self.server_name}
+        request = {
+            "method": method.decode("ascii"),
+            "uri": url_bytes.decode("ascii"),
+            "origin": self.server_name,
+        }
 
         if destination is not None:
-            request["destination"] = destination
+            request["destination"] = destination.decode("ascii")
 
         if destination_is is not None:
-            request["destination_is"] = destination_is
+            request["destination_is"] = destination_is.decode("ascii")
 
         if content is not None:
             request["content"] = content