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-rw-r--r--rpkid/rpki/rpkid_tasks.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/rpkid/rpki/rpkid_tasks.py b/rpkid/rpki/rpkid_tasks.py
index 7fbefc62..d343012e 100644
--- a/rpkid/rpki/rpkid_tasks.py
+++ b/rpkid/rpki/rpkid_tasks.py
@@ -256,7 +256,7 @@ class UpdateChildrenTask(AbstractTask):
ca = ca_detail.ca
if ca_detail.state == "active":
old_resources = child_cert.cert.get_3779resources()
- new_resources = irdb_resources.intersection(old_resources).intersection(ca_detail.latest_ca_cert.get_3779resources())
+ new_resources = old_resources & irdb_resources & ca_detail.latest_ca_cert.get_3779resources()
if new_resources.empty():
rpki.log.debug("Resources shrank to the null set, revoking and withdrawing child %s certificate SKI %s" % (child.child_handle, child_cert.cert.gSKI()))