diff --git a/tests/ftp/ftp-too-long-command/test.yaml b/tests/ftp/ftp-too-long-command/test.yaml
index f59c0cd42d..3336d88834 100644
--- a/tests/ftp/ftp-too-long-command/test.yaml
+++ b/tests/ftp/ftp-too-long-command/test.yaml
@@ -5,7 +5,7 @@ checks:
       match:
         event_type: ftp
         ftp.command: RETR
-        ftp.command_data.__len: 4090
+        ftp.command_data.__len: 4091
         ftp.command_truncated: true
         ftp.reply_truncated: false