diff --git a/src/sage/rings/number_field/number_field.py b/src/sage/rings/number_field/number_field.py
index dbd8e7e2edf..39fc3519011 100644
--- a/src/sage/rings/number_field/number_field.py
+++ b/src/sage/rings/number_field/number_field.py
@@ -8852,7 +8852,7 @@ def _subfields_helper(self, degree=0, name=None, both_maps=True, optimize=False)
             pass
         f = self.pari_polynomial()
         if optimize:
-            v = f.polred(2)
+            v = f.polredbest(2)
             elts = v[0]
             polys = v[1]
         else: