diff --git a/atomistics/calculators/output.py b/atomistics/calculators/output.py
index 216db0ef..4ca8f1ef 100644
--- a/atomistics/calculators/output.py
+++ b/atomistics/calculators/output.py
@@ -2,25 +2,24 @@
 
 
 @dataclasses.dataclass
-class AtomisticsOutput:
+class Output:
     @classmethod
     def fields(cls):
         return tuple(field.name for field in dataclasses.fields(cls))
 
-    @classmethod
-    def get(cls, engine, *quantities: str) -> dict:
-        return {q: getattr(cls, q)(engine) for q in quantities}
+    def get(self, engine, *quantities: str) -> dict:
+        return {q: getattr(self, q)(engine) for q in quantities}
 
 
 @dataclasses.dataclass
-class OutputStatic(AtomisticsOutput):
+class OutputStatic(Output):
     forces: callable
     energy: callable
     stress: callable
 
 
 @dataclasses.dataclass
-class OutputMolecularDynamics(AtomisticsOutput):
+class OutputMolecularDynamics(Output):
     positions: callable
     cell: callable
     forces: callable