diff --git a/handler.py b/handler.py
index e7ef979..dd65551 100644
--- a/handler.py
+++ b/handler.py
@@ -132,7 +132,7 @@ def invoke_claude_3(messages):
 def reply_text(messages, channel, ts, user):
     message = invoke_claude_3(messages)
 
-    message = re.sub(f"**", "*", message)
+    message = re.sub("**", "*", message)
 
     chat_update(channel, ts, message)