diff --git a/rectools/models/nn/transformers/base.py b/rectools/models/nn/transformers/base.py
index 86899394..75029699 100644
--- a/rectools/models/nn/transformers/base.py
+++ b/rectools/models/nn/transformers/base.py
@@ -225,6 +225,7 @@ class TransformerModelConfig(ModelConfig):
     item_net_constructor_kwargs: tp.Optional[InitKwargs] = None
     pos_encoding_kwargs: tp.Optional[InitKwargs] = None
     lightning_module_kwargs: tp.Optional[InitKwargs] = None
+    negative_sampler_kwargs: tp.Optional[InitKwargs] = None
     similarity_module_kwargs: tp.Optional[InitKwargs] = None
     backbone_kwargs: tp.Optional[InitKwargs] = None
 
diff --git a/tests/models/nn/transformers/test_bert4rec.py b/tests/models/nn/transformers/test_bert4rec.py
index 9b0c10db..e1c9fb4b 100644
--- a/tests/models/nn/transformers/test_bert4rec.py
+++ b/tests/models/nn/transformers/test_bert4rec.py
@@ -865,6 +865,7 @@ def initial_config(self) -> tp.Dict[str, tp.Any]:
             "item_net_constructor_kwargs": None,
             "pos_encoding_kwargs": None,
             "lightning_module_kwargs": None,
+            "negative_sampler_kwargs": None,
             "similarity_module_kwargs": None,
             "backbone_kwargs": None,
         }
diff --git a/tests/models/nn/transformers/test_sasrec.py b/tests/models/nn/transformers/test_sasrec.py
index 4f855da7..24438cc4 100644
--- a/tests/models/nn/transformers/test_sasrec.py
+++ b/tests/models/nn/transformers/test_sasrec.py
@@ -973,6 +973,7 @@ def initial_config(self) -> tp.Dict[str, tp.Any]:
             "item_net_constructor_kwargs": None,
             "pos_encoding_kwargs": None,
             "lightning_module_kwargs": None,
+            "negative_sampler_kwargs": None,
             "similarity_module_kwargs": None,
             "backbone_kwargs": None,
         }