diff --git a/Lib/test/libregrtest/refleak.py b/Lib/test/libregrtest/refleak.py
index a257d1023537b9..568690bdec4b90 100644
--- a/Lib/test/libregrtest/refleak.py
+++ b/Lib/test/libregrtest/refleak.py
@@ -239,9 +239,13 @@ def dash_R_cleanup(fs, ps, pic, zdc, abcs):
abs_classes = filter(isabstract, abs_classes)
for abc in abs_classes:
for obj in abc.__subclasses__() + [abc]:
- for ref in abcs.get(obj, set()):
- if ref() is not None:
- obj.register(ref())
+ refs = abcs.get(obj, None)
+ if refs is not None:
+ obj._abc_registry_clear()
+ for ref in refs:
+ subclass = ref()
+ if subclass is not None:
+ obj.register(subclass)
obj._abc_caches_clear()
# Clear caches
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