diff --git a/tests/test_metalearner.py b/tests/test_metalearner.py
index 5721f5c..d9ac1f6 100644
--- a/tests/test_metalearner.py
+++ b/tests/test_metalearner.py
@@ -107,7 +107,7 @@ def fit_all_treatment(
     def predict(self, X, is_oos, oos_method=None):
         return np.zeros((len(X), self.n_variants - 1, 1))
 
-    def evaluate(self, X, y, w, is_oos, oos_method=None):
+    def evaluate(self, X, y, w, is_oos, oos_method=None, scoring=None):
         return {}
 
     def predict_conditional_average_outcomes(self, X, is_oos, oos_method=None):