diff --git a/lib/net/imap.rb b/lib/net/imap.rb
index 0db970dc..c192f512 100644
--- a/lib/net/imap.rb
+++ b/lib/net/imap.rb
@@ -3508,7 +3508,7 @@ def get_tagged_response(tag, cmd, timeout = nil)
         raise BadResponseError, resp
       else
         disconnect
-        raise InvalidResponseError, "invalid tagged resp: %p" % [resp.raw.chomp]
+        raise InvalidResponseError, "invalid tagged resp: %p" % [resp.raw_data.chomp]
       end
     end