diff --git a/PyViCare/PyViCareVentilationDevice.py b/PyViCare/PyViCareVentilationDevice.py
index 66b94e4e..4169ffb2 100644
--- a/PyViCare/PyViCareVentilationDevice.py
+++ b/PyViCare/PyViCareVentilationDevice.py
@@ -44,7 +44,7 @@ def getVentilationLevels(self) -> list[str]:
     @handleNotSupported
     @deprecated(reason="renamed, use getVentilationLevels")
     def getPermanentLevels(self) -> list[str]:
-        return self.getVentilationLevels()
+        return list[str](self.getVentilationLevels())
 
     @handleNotSupported
     def getVentilationLevel(self) -> str: