diff --git a/tests/functional/qemu_test/tesseract.py b/tests/functional/qemu_test/tesseract.py
index 862faec2d2..9d98181cb4 100644
--- a/tests/functional/qemu_test/tesseract.py
+++ b/tests/functional/qemu_test/tesseract.py
@@ -1,19 +1,21 @@
-# ...
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # Copyright (c) 2019 Philippe Mathieu-Daudé
-#
-# This work is licensed under the terms of the GNU GPL, version 2 or
-# later. See the COPYING file in the top-level directory.
+'''
+Tesseract is an program for doing Optical Character Recognition (OCR),
+which can be used in the tests to extract text from screenshots.
+'''
 
 import logging
 from subprocess import run
 
 
-def tesseract_ocr(image_path, tesseract_args=''):
+def tesseract_ocr(image_path):
+    ''' Run the tesseract OCR to extract text from a screenshot '''
     console_logger = logging.getLogger('console')
     console_logger.debug(image_path)
     proc = run(['tesseract', image_path, 'stdout'],
-               capture_output=True, encoding='utf8')
+               capture_output=True, encoding='utf8', check=False)
     if proc.returncode:
         return None
     lines = []