diff --git a/tests/unit/test_fused_router.py b/tests/unit/test_fused_router.py
index 135dd67c..3250cef4 100644
--- a/tests/unit/test_fused_router.py
+++ b/tests/unit/test_fused_router.py
@@ -39,7 +39,7 @@ def test_fused_router():
     from dsv4.layers.linear import Nvfp4Linear
     gate_lin = Nvfp4Linear(in_features=K, out_features=N, device=device)
     gate_lin.fp4 = [w_fp4.contiguous()]
-    gate_lin.scale_b = [w_sf.contiguous()]
+    gate_lin.sf = [w_sf.contiguous()]
     gate_lin.gsb = [ws2_val]
     gate_lin._activation_global_scale = None  # set at runtime
     gate_lin._ensure_stacked = lambda *a, **kw: None