diff --git a/modelopt_recipes/configs/ptq/presets/model/nvfp4_w4a4_weight_mse_fp8_sweep.yaml b/modelopt_recipes/configs/ptq/presets/model/nvfp4_w4a4_weight_mse_fp8_sweep.yaml
index 3ae22dbc3a6..a503f8e86fd 100644
--- a/modelopt_recipes/configs/ptq/presets/model/nvfp4_w4a4_weight_mse_fp8_sweep.yaml
+++ b/modelopt_recipes/configs/ptq/presets/model/nvfp4_w4a4_weight_mse_fp8_sweep.yaml
@@ -25,6 +25,7 @@ imports:
 algorithm:
   method: mse
   fp8_scale_sweep: true
+effective_bits: 4.5
 quant_cfg:
   - $import: base_disable_all
   - quantizer_name: '*weight_quantizer'
diff --git a/tests/unit/recipe/test_presets.py b/tests/unit/recipe/test_presets.py
index 89645773f93..15b7e19061b 100644
--- a/tests/unit/recipe/test_presets.py
+++ b/tests/unit/recipe/test_presets.py
@@ -63,6 +63,10 @@ def test_kv_none_sentinel_is_not_a_discovered_preset():
     assert presets.KV_CACHE_NONE not in presets.KV_QUANT_CFG_CHOICES
 
 
+def test_nvfp4_mse_preset_uses_nvfp4_storage_cost():
+    assert presets.QUANT_CFG_CHOICES["nvfp4_w4a4_weight_mse_fp8_sweep"]["effective_bits"] == 4.5
+
+
 def test_w4a16_nvfp4_preset_disables_vllm_marlin_incompatible_projections():
     disabled_quantizers = {
         entry["quantizer_name"]