diff --git a/src/pykoopman/koopman.py b/src/pykoopman/koopman.py
index 3aefe07..d70af2a 100644
--- a/src/pykoopman/koopman.py
+++ b/src/pykoopman/koopman.py
@@ -554,9 +554,9 @@ def score(self, x, y=None, cast_as_real=True, metric=r2_score, **metric_kws):
                 )
         else:
             if cast_as_real:
-                return metric(y.real, self.predict(x).real, **metric_kws)
+                return metric(y.real, self.predict(x, **metric_kws).real)
             else:
-                return metric(y, self.predict(x), **metric_kws)
+                return metric(y, self.predict(x, **metric_kws))
 
     def _observable(self):
         """Returns the observable transformation."""