diff --git a/test/functional/feature_notifications.py b/test/functional/feature_notifications.py
index 9bcecb2d34..6547dd5311 100755
--- a/test/functional/feature_notifications.py
+++ b/test/functional/feature_notifications.py
@@ -16,7 +16,7 @@ from test_framework.util import (
 # Windows disallow control characters (0-31) and /\?%:|"<>
 FILE_CHAR_START = 32 if os.name == 'nt' else 1
 FILE_CHAR_END = 128
-FILE_CHAR_BLOCKLIST = '/\\?%*:|"<>' if os.name == 'nt' else '/'
+FILE_CHARS_DISALLOWED = '/\\?%*:|"<>' if os.name == 'nt' else '/'
 
 
 def notify_outputname(walletname, txid):
@@ -29,7 +29,7 @@ class NotificationsTest(BitcoinTestFramework):
         self.setup_clean_chain = True
 
     def setup_network(self):
-        self.wallet = ''.join(chr(i) for i in range(FILE_CHAR_START, FILE_CHAR_END) if chr(i) not in FILE_CHAR_BLOCKLIST)
+        self.wallet = ''.join(chr(i) for i in range(FILE_CHAR_START, FILE_CHAR_END) if chr(i) not in FILE_CHARS_DISALLOWED)
         self.alertnotify_dir = os.path.join(self.options.tmpdir, "alertnotify")
         self.blocknotify_dir = os.path.join(self.options.tmpdir, "blocknotify")
         self.walletnotify_dir = os.path.join(self.options.tmpdir, "walletnotify")