diff --git a/src/gallium/drivers/d3d12/d3d12_video_enc_h264.cpp b/src/gallium/drivers/d3d12/d3d12_video_enc_h264.cpp
index c1aa8aa2187..a7190197754 100644
--- a/src/gallium/drivers/d3d12/d3d12_video_enc_h264.cpp
+++ b/src/gallium/drivers/d3d12/d3d12_video_enc_h264.cpp
@@ -398,7 +398,7 @@ d3d12_video_encoder_update_current_frame_pic_params_info_h264(struct d3d12_video
    pD3D12Enc->m_upDPBManager->get_current_frame_picture_control_data(picParams);
 
    // Save state snapshot from record time to resolve headers at get_feedback time
-   uint64_t current_metadata_slot = (pD3D12Enc->m_fenceValue % D3D12_VIDEO_ENC_METADATA_BUFFERS_COUNT);
+   size_t current_metadata_slot = static_cast<size_t>(pD3D12Enc->m_fenceValue % D3D12_VIDEO_ENC_METADATA_BUFFERS_COUNT);
    pD3D12Enc->m_spEncodedFrameMetadata[current_metadata_slot].m_associatedEncodeCapabilities =
       pD3D12Enc->m_currentEncodeCapabilities;
    pD3D12Enc->m_spEncodedFrameMetadata[current_metadata_slot].m_associatedEncodeConfig =