diff --git a/swh/loader/core/loader.py b/swh/loader/core/loader.py
--- a/swh/loader/core/loader.py
+++ b/swh/loader/core/loader.py
@@ -170,7 +170,7 @@
 
         """
         assert self.origin
-        self.storage.origin_add_one(self.origin)
+        self.storage.origin_add([self.origin])
 
         if not self.visit_date:  # now as default visit_date if not provided
             self.visit_date = datetime.datetime.now(tz=datetime.timezone.utc)
diff --git a/swh/loader/core/tests/test_loader.py b/swh/loader/core/tests/test_loader.py
--- a/swh/loader/core/tests/test_loader.py
+++ b/swh/loader/core/tests/test_loader.py
@@ -34,9 +34,9 @@
         self.origin_url = ORIGIN.url
         self.visit_date = datetime.datetime.now(tz=datetime.timezone.utc)
         self.visit_type = "git"
-        origin_url = self.storage.origin_add_one(ORIGIN)
+        self.storage.origin_add([ORIGIN])
         visit = OriginVisit(
-            origin=origin_url, date=self.visit_date, type=self.visit_type,
+            origin=self.origin_url, date=self.visit_date, type=self.visit_type,
         )
         self.visit = self.storage.origin_visit_add([visit])[0]
 
diff --git a/swh/loader/package/loader.py b/swh/loader/package/loader.py
--- a/swh/loader/package/loader.py
+++ b/swh/loader/package/loader.py
@@ -299,7 +299,7 @@
         # Prepare origin and origin_visit
         origin = Origin(url=self.url)
         try:
-            self.storage.origin_add_one(origin)
+            self.storage.origin_add([origin])
             visit = self.storage.origin_visit_add(
                 [
                     OriginVisit(
diff --git a/swh/loader/package/tests/test_loader.py b/swh/loader/package/tests/test_loader.py
--- a/swh/loader/package/tests/test_loader.py
+++ b/swh/loader/package/tests/test_loader.py
@@ -7,7 +7,7 @@
 
 
 class FakeStorage:
-    def origin_add_one(self, origin):
+    def origin_add(self, origins):
         raise ValueError("We refuse to add an origin")
 
     def origin_visit_get_latest(self, origin):
@@ -15,8 +15,8 @@
 
 
 class FakeStorage2(FakeStorage):
-    def origin_add_one(self, origin):
-        return origin
+    def origin_add(self, origins):
+        pass
 
     def origin_visit_add(self, visits):
         raise ValueError("We refuse to add an origin visit")