diff --git a/patches/staging_kernel.py b/patches/staging_kernel.py
index 9942eb4..d409d14 100644
--- a/patches/staging_kernel.py
+++ b/patches/staging_kernel.py
@@ -113,7 +113,7 @@ def _deepseek_v4_stage_mega_moe_inputs_kernel(
     e2m1_packed = (e2m1_hi << 4 | e2m1_lo).to(tl.uint8)  # [BLOCK_K // 2]
 
     k_offsets_out = k_block_id * (BLOCK_K // 2) + tl.arange(0, BLOCK_K // 2)
-    k_mask_out = (k_block_id * BLOCK_K // 2 + k_offsets_out) < (hidden_size // 2)
+    k_mask_out = k_offsets_out < (hidden_size // 2)
     tl.store(
         x_fp4 + token_id * x_stride_m + k_offsets_out * x_stride_k,
         e2m1_packed,