diff --git a/src/h3_blackwell_runtime/qwen3vl_vision.py b/src/h3_blackwell_runtime/qwen3vl_vision.py
index 05eae4c..7fd2fcb 100644
--- a/src/h3_blackwell_runtime/qwen3vl_vision.py
+++ b/src/h3_blackwell_runtime/qwen3vl_vision.py
@@ -213,7 +213,8 @@ class _VisionPatchEmbed(nn.Module):
     def forward(self, x: torch.Tensor) -> torch.Tensor:
         target = self.weight.dtype
         x = x.view(-1, 3, VISION_TEMPORAL, VISION_PATCH, VISION_PATCH)
-        return F.conv3d(x.to(target), self.weight, self.bias, kernel_size=(VISION_TEMPORAL, VISION_PATCH, VISION_PATCH), stride=(VISION_TEMPORAL, VISION_PATCH, VISION_PATCH)).view(-1, self.weight.shape[0])
+        s = (VISION_TEMPORAL, VISION_PATCH, VISION_PATCH)
+        return F.conv3d(x.to(target), self.weight, self.bias, stride=s).view(-1, self.weight.shape[0])
 
 
 class _VisionMLP(nn.Module):