diff --git a/quantus/metrics/randomisation/model_parameter_randomisation.py b/quantus/metrics/randomisation/model_parameter_randomisation.py
index 4991bf821..6d4bcac32 100644
--- a/quantus/metrics/randomisation/model_parameter_randomisation.py
+++ b/quantus/metrics/randomisation/model_parameter_randomisation.py
@@ -391,4 +391,4 @@ def compute_correlation_per_sample(
         return corr_coeffs
 
     def evaluate_batch(self, *args, **kwargs):
-        raise RuntimeError("This is unexpected.")
+        raise RuntimeError("`evaluate_batch` must never be called for `ModelParameterRandomisation`.")