diff --git a/src/frequenz/sdk/timeseries/_formula_engine/_formula_engine.py b/src/frequenz/sdk/timeseries/_formula_engine/_formula_engine.py
index ef2681827..28ed475d7 100644
--- a/src/frequenz/sdk/timeseries/_formula_engine/_formula_engine.py
+++ b/src/frequenz/sdk/timeseries/_formula_engine/_formula_engine.py
@@ -174,11 +174,13 @@ async def apply(self) -> Sample:
     "HigherOrderFormulaBuilder3Phase",
 ]
 
+# pylint: disable=invalid-name
 _CompositionType1Phase = Union[
     "FormulaEngine",
     "HigherOrderFormulaBuilder",
 ]
 
+# pylint: disable=invalid-name
 _CompositionType3Phase = Union[
     "FormulaEngine3Phase",
     "HigherOrderFormulaBuilder3Phase",