diff --git a/lib/chessh/ssh/client/trongle_chat.ex b/lib/chessh/ssh/client/trongle_chat.ex
index 3ea0d6d..1292fa7 100644
--- a/lib/chessh/ssh/client/trongle_chat.ex
+++ b/lib/chessh/ssh/client/trongle_chat.ex
@@ -96,7 +96,7 @@ defmodule Chessh.SSH.Client.TrongleChat do
           height: height
         } = state
       ) do
-    safe_char_regex = ~r/[ A-Za-z0-9._~()'!*:@,;+?-]/
+    safe_char_regex = ~r/^[ A-Za-z0-9._~()'!*:@,;+?-]+$/
 
     appended_message_state =
       case action do