diff --git a/src/DIRAC/Resources/Catalog/RucioFileCatalogClient.py b/src/DIRAC/Resources/Catalog/RucioFileCatalogClient.py
index 8700a8eb237..638dd967e30 100644
--- a/src/DIRAC/Resources/Catalog/RucioFileCatalogClient.py
+++ b/src/DIRAC/Resources/Catalog/RucioFileCatalogClient.py
@@ -27,20 +27,19 @@
 RUCIO_COLLECTION_TYPES = {"DATASET", "CONTAINER"}
 
 
-def get_scope(lfn, scopes=None, diracAlgorithm="dirac"):
+def get_scope(lfn, scopes=None, default_extract="def"):
     """
     Helper function that extracts the scope from the LFN.
 
     :param str lfn: Logical file name
     :param list scopes: list of scopes
-    :param str diracAlgorithm: only used by extract_scope if there is no config file with an algorithm listed.
-                               Otherwise use the algorithm listed in the config file.
+    :param str default_extract: fallback algorithm used by Rucio if no config file defines one.
     :return: scope name
     """
 
     if scopes is None:
         scopes = []
-    scope, _ = extract_scope(did=lfn, scopes=scopes, default_extract=diracAlgorithm)
+    scope, _ = extract_scope(did=lfn, scopes=scopes, default_extract=default_extract)
     return scope
 
 
@@ -106,7 +105,7 @@ def __init__(self, **options):
 
         :param options: options dict
         """
-        self.diracScopeAlg = options.get("DiracScopeAlg", "dirac")
+        self.scopeExtractAlg = options.get("DiracScopeAlg", "def")
         self.useDiracCS = False  # use a Rucio config file
         self.convertUnicode = True
         proxyInfo = {"OK": False}
@@ -206,7 +205,7 @@ def __getDidsFromLfn(self, lfn):
         if lfn.find(":") > -1:
             scope, name = lfn.split(":")
         else:
-            scope = get_scope(lfn, scopes=self.scopes, diracAlgorithm=self.diracScopeAlg)
+            scope = get_scope(lfn, scopes=self.scopes, default_extract=self.scopeExtractAlg)
             name = lfn
         return {"scope": scope, "name": name}
 
diff --git a/src/DIRAC/Resources/Catalog/test/Test_RucioFileCatalogClient.py b/src/DIRAC/Resources/Catalog/test/Test_RucioFileCatalogClient.py
index d3afd07f6cf..3e0ead8ddd8 100644
--- a/src/DIRAC/Resources/Catalog/test/Test_RucioFileCatalogClient.py
+++ b/src/DIRAC/Resources/Catalog/test/Test_RucioFileCatalogClient.py
@@ -1,6 +1,6 @@
 import unittest
 from unittest.mock import MagicMock, patch
-from DIRAC.Resources.Catalog.RucioFileCatalogClient import RucioFileCatalogClient
+from DIRAC.Resources.Catalog.RucioFileCatalogClient import RucioFileCatalogClient, get_scope
 
 
 class TestRucioFileCatalogClient(unittest.TestCase):
@@ -13,6 +13,35 @@ def setUp(self):
     def tearDown(self):
         self.patcher.stop()
 
+    @patch("DIRAC.Resources.Catalog.RucioFileCatalogClient.extract_scope")
+    def test_get_scope_defaults_to_rucio_default_algorithm(self, mock_extract_scope):
+        mock_extract_scope.return_value = ("atlas", "atlas:file")
+
+        scope = get_scope("atlas:file", scopes=["atlas"])
+
+        self.assertEqual(scope, "atlas")
+        mock_extract_scope.assert_called_once_with(did="atlas:file", scopes=["atlas"], default_extract="def")
+
+    @patch("DIRAC.Resources.Catalog.RucioFileCatalogClient.extract_scope")
+    def test_get_scope_can_still_take_an_explicit_algorithm(self, mock_extract_scope):
+        mock_extract_scope.return_value = ("atlas", "atlas:file")
+
+        scope = get_scope("atlas:file", scopes=["atlas"], default_extract="dirac")
+
+        self.assertEqual(scope, "atlas")
+        mock_extract_scope.assert_called_once_with(did="atlas:file", scopes=["atlas"], default_extract="dirac")
+
+    @patch("DIRAC.Resources.Catalog.RucioFileCatalogClient.get_scope")
+    def test_get_dids_from_lfn_uses_updated_scope_keyword(self, mock_get_scope):
+        mock_get_scope.return_value = "atlas"
+
+        result = self.client._RucioFileCatalogClient__getDidsFromLfn("atlas.file")
+
+        self.assertEqual(result, {"scope": "atlas", "name": "atlas.file"})
+        mock_get_scope.assert_called_once_with(
+            "atlas.file", scopes=["test_scope"], default_extract=self.client.scopeExtractAlg
+        )
+
     def test_transform_DIRAC_operator_to_Rucio(self):
         DIRAC_dict = {"key1": "value1", "key2": {">": 10}, "key3": {"=": 10}}
         expected_output = {"key1": "value1", "key2.gt": 10, "key3": 10}