diff --git a/tests/planning/test_planning.py b/tests/planning/test_planning.py
index c01446a6..963fc7f4 100644
--- a/tests/planning/test_planning.py
+++ b/tests/planning/test_planning.py
@@ -1,4 +1,4 @@
-from typing import Optional, Type
+from typing import Optional, Type, List
 import warnings
 import pytest
 from hcraft.env import HcraftEnv
@@ -23,6 +23,9 @@ def planning_fixture() -> "PlanningFixture":
 
 
 class PlanningFixture:
+    def __init__(self) -> None:
+        pytest.importorskip("unified_planning")
+
     def given_env(self, env: HcraftEnv) -> None:
         self.env = env
 
@@ -41,7 +44,7 @@ def then_warning_should_be_given(
 
 
 def _warning_in_records(
-    warning_records: list[warnings.WarningMessage],
+    warning_records: List[warnings.WarningMessage],
     warning_type: Type[Warning],
     match: Optional[str],
 ) -> bool: