diff --git a/prv_candidates_step/prv_candidates_step/core/strategy/ztf.py b/prv_candidates_step/prv_candidates_step/core/strategy/ztf.py
index 0b1bc97e5..184884bbe 100644
--- a/prv_candidates_step/prv_candidates_step/core/strategy/ztf.py
+++ b/prv_candidates_step/prv_candidates_step/core/strategy/ztf.py
@@ -23,8 +23,8 @@ def prv_forced_photometry_mapper() -> dict:
 
     mapping.update(
         {
-            "e_ra": Mapper(lambda x: 0),
-            "e_dec": Mapper(lambda x: 0),
+            "e_ra": Mapper(lambda: 0),
+            "e_dec": Mapper(lambda: 0),
             "isdiffpos": Mapper(
                 lambda x: 1 if x >= 0 else -1, origin="forcediffimflux"
             ),
diff --git a/sorting_hat_step/tests/unittest/test_wizard.py b/sorting_hat_step/tests/unittest/test_wizard.py
index 829714c4c..03762548d 100644
--- a/sorting_hat_step/tests/unittest/test_wizard.py
+++ b/sorting_hat_step/tests/unittest/test_wizard.py
@@ -150,10 +150,10 @@ def test_decode(self):
     def test_write_object(self, insert_mock):
         alerts = pd.DataFrame(
             [
-                {"oid": 10, "aid": 0, "sid": "ZTF", "extra": "extra1"},
-                {"oid": 20, "aid": 1, "sid": "ZTF", "extra": "extra2"},
-                {"oid": 30, "aid": 0, "sid": "ZTF", "extra": "extra3"},
-                {"oid": 40, "aid": 2, "sid": "ZTF", "extra": "extra4"},
+                {"oid": 10, "aid": 0, "sid": "ZTF", "extra_fields": {}},
+                {"oid": 20, "aid": 1, "sid": "ZTF", "extra_fields": {}},
+                {"oid": 30, "aid": 0, "sid": "ZTF", "extra_fields": {}},
+                {"oid": 40, "aid": 2, "sid": "ZTF", "extra_fields": {}},
             ]
         )