diff --git a/testgres/helpers/port_manager.py b/testgres/helpers/port_manager.py
index 6afdf8a9..cfc5c096 100644
--- a/testgres/helpers/port_manager.py
+++ b/testgres/helpers/port_manager.py
@@ -26,10 +26,11 @@ def find_free_port(self, ports: Optional[Set[int]] = None, exclude_ports: Option
if ports is None:
ports = set(range(1024, 65535))
- if exclude_ports is None:
- exclude_ports = set()
+ assert type(ports) == set # noqa: E721
- ports.difference_update(set(exclude_ports))
+ if exclude_ports is not None:
+ assert isinstance(exclude_ports, Iterable)
+ ports.difference_update(exclude_ports)
sampled_ports = random.sample(tuple(ports), min(len(ports), 100))
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