diff --git a/benchs/bench_fw/descriptors.py b/benchs/bench_fw/descriptors.py
index 8b1d65a505..d40243bb5b 100644
--- a/benchs/bench_fw/descriptors.py
+++ b/benchs/bench_fw/descriptors.py
@@ -106,6 +106,8 @@ class DatasetDescriptor:
     # desc_name
     desc_name: Optional[str] = None
 
+    normalize_L2: bool = False
+
     def __hash__(self):
         return hash(self.get_filename())
 
diff --git a/benchs/bench_fw/index.py b/benchs/bench_fw/index.py
index fe2fe103ef..b1252ad1b0 100644
--- a/benchs/bench_fw/index.py
+++ b/benchs/bench_fw/index.py
@@ -1138,6 +1138,8 @@ def assemble(self, dry_run):
                 return None, None, ""
             logger.info(f"assemble, train {self.factory}")
             xt = self.io.get_dataset(self.training_vectors)
+            if self.training_vectors.normalize_L2:
+                faiss.normalize_L2(xt)
             _, t, _ = timer("train", lambda: codec.train(xt), once=True)
             t_aggregate += t