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-rw-r--r--python/vyos/firewall.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/python/vyos/firewall.py b/python/vyos/firewall.py
index a74fd922a..c1217b420 100644
--- a/python/vyos/firewall.py
+++ b/python/vyos/firewall.py
@@ -208,7 +208,7 @@ def parse_rule(rule_conf, fw_name, rule_id, ip_name):
def parse_tcp_flags(flags):
include = [flag for flag in flags if flag != 'not']
exclude = list(flags['not']) if 'not' in flags else []
- return f'tcp flags & ({"|".join(include + exclude)}) == {"|".join(include)}'
+ return f'tcp flags & ({"|".join(include + exclude)}) == {"|".join(include) if include else "0x0"}'
def parse_time(time):
out = []