diff --git a/tests/ooxml/test_zip_sub_file.py b/tests/ooxml/test_zip_sub_file.py
index 44220b0..ac49fb5 100644
--- a/tests/ooxml/test_zip_sub_file.py
+++ b/tests/ooxml/test_zip_sub_file.py
@@ -13,7 +13,7 @@ from oletools.ooxml import ZipSubFile
 
 
 # flag to get more output to facilitate search for errors
-DEBUG = True
+DEBUG = False
 
 # name of a temporary .zip file on the system
 ZIP_TEMP_FILE = ''