diff --git a/calflops/flops_counter_hf.py b/calflops/flops_counter_hf.py
index 5d4e21e..6e4eb63 100644
--- a/calflops/flops_counter_hf.py
+++ b/calflops/flops_counter_hf.py
@@ -29,7 +29,7 @@ def calculate_flops_hf(model_name,
                        empty_model=None,
                        input_shape=None,
                        trust_remote_code=True,
-                       access_token="",
+                       access_token=None,
                        forward_mode="forward",
                        include_backPropagation=False,
                        compute_bp_factor=2.0,