diff --git a/dsv4/ops/gemm_runner.py b/dsv4/ops/gemm_runner.py
index e9ec40e9..a7d24b68 100644
--- a/dsv4/ops/gemm_runner.py
+++ b/dsv4/ops/gemm_runner.py
@@ -13,6 +13,7 @@ from dsv4.ops.quantize import (
     quantize_weight_to_nvfp4,
     quantize_to_nvfp4,
     deinterleave_quantize_nvfp4_cuda,
+    SF_VEC_SIZE,
 )
 from dsv4.ops.layouts import (
     interleave_l1_weights,