1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/replication/tcp/commands.py b/synapse/replication/tcp/commands.py
index 5002efe6a0..f26aee83cb 100644
--- a/synapse/replication/tcp/commands.py
+++ b/synapse/replication/tcp/commands.py
@@ -462,7 +462,7 @@ def parse_command_from_line(line: str) -> Command:
     Line should already be stripped of whitespace and be checked if blank.
     """
 
-    idx = line.index(" ")
+    idx = line.find(" ")
     if idx >= 0:
         cmd_name = line[:idx]
         rest_of_line = line[idx + 1 :]