diff --git a/src/anemoi/transform/variables/__init__.py b/src/anemoi/transform/variables/__init__.py
index 0776b59..bb49775 100644
--- a/src/anemoi/transform/variables/__init__.py
+++ b/src/anemoi/transform/variables/__init__.py
@@ -40,10 +40,12 @@ def __eq__(self, other) -> bool:
             return False
         return self.name == other.name
 
+    @property
     @abstractmethod
     def is_pressure_level(self):
         pass
 
+    @property
     @abstractmethod
     def level(self):
         pass
diff --git a/src/anemoi/transform/variables/variables.py b/src/anemoi/transform/variables/variables.py
index 24679b6..53c4303 100644
--- a/src/anemoi/transform/variables/variables.py
+++ b/src/anemoi/transform/variables/variables.py
@@ -15,9 +15,11 @@ def __init__(self, name, data: dict) -> None:
         super().__init__(name)
         self.data = data
 
+    @property
     def is_pressure_level(self):
         return self.data.get("levtype", None) == "pl"
 
+    @property
     def level(self):
         return self.data.get("levelist", None)