diff --git a/dsv4/kernels/router/nvfp4_fused_router_kernel.py b/dsv4/kernels/router/nvfp4_fused_router_kernel.py
index 920600ac..398422f6 100644
--- a/dsv4/kernels/router/nvfp4_fused_router_kernel.py
+++ b/dsv4/kernels/router/nvfp4_fused_router_kernel.py
@@ -70,6 +70,7 @@ class Nvfp4FusedRouterKernel:
         self.mma_tiler_mn = mma_tiler_mn
         self.cluster_shape_mn = cluster_shape_mn
         self.top_k = top_k
+        self.sf_vec_size = sf_vec_size
 
         self.use_2cta_instrs = mma_tiler_mn[0] == 256
         self.cta_group = tcgen05.CtaGroup.TWO if self.use_2cta_instrs else tcgen05.CtaGroup.ONE