diff --git a/python/featomic/featomic/clebsch_gordan/_equivariant_power_spectrum_by_pair.py b/python/featomic/featomic/clebsch_gordan/_equivariant_power_spectrum_by_pair.py
index c867e5048..4dd2d7780 100644
--- a/python/featomic/featomic/clebsch_gordan/_equivariant_power_spectrum_by_pair.py
+++ b/python/featomic/featomic/clebsch_gordan/_equivariant_power_spectrum_by_pair.py
@@ -178,7 +178,7 @@ def __init__(
         parameters_1 = json.loads(calculator_1.parameters)
 
         # For the moment, only spherical expansion by pair is supported for calculator_2
-        if self.calculator_2.c_name not in supported_calculators:
+        if self.calculator_2.c_name not in supported_calculators_2:
             raise ValueError(
                 f"Only [{', '.join(supported_calculators)}] are supported for "
                 f"`calculator_2`, got '{self.calculator_2.c_name}'"