diff --git a/src/gallium/frontends/va/picture_av1.c b/src/gallium/frontends/va/picture_av1.c
index 1f6a9494adf..e6f2652e362 100644
--- a/src/gallium/frontends/va/picture_av1.c
+++ b/src/gallium/frontends/va/picture_av1.c
@@ -392,6 +392,8 @@ void vlVaHandlePictureParameterBufferAV1(vlVaDriver *drv, vlVaContext *context,
       else
          vlVaGetReferenceFrame(drv, av1->ref_frame_map[i], &context->desc.av1.ref[i]);
    }
+
+  context->desc.av1.slice_parameter.slice_count = 0;
 }
 
 void vlVaHandleSliceParameterBufferAV1(vlVaContext *context, vlVaBuffer *buf, unsigned num_slices)
@@ -409,5 +411,6 @@ void vlVaHandleSliceParameterBufferAV1(vlVaContext *context, vlVaBuffer *buf, un
       context->desc.av1.slice_parameter.slice_data_row[slice_index] = av1->tile_row;
       context->desc.av1.slice_parameter.slice_data_col[slice_index] = av1->tile_column;
       context->desc.av1.slice_parameter.slice_data_anchor_frame_idx[slice_index] = av1->anchor_frame_idx;
+      context->desc.av1.slice_parameter.slice_count = slice_index + 1;
    }
 }
diff --git a/src/gallium/include/pipe/p_video_state.h b/src/gallium/include/pipe/p_video_state.h
index ccf86e548db..8ca665966b8 100644
--- a/src/gallium/include/pipe/p_video_state.h
+++ b/src/gallium/include/pipe/p_video_state.h
@@ -1377,6 +1377,7 @@ struct pipe_av1_picture_desc
       uint16_t slice_data_row[256];
       uint16_t slice_data_col[256];
       uint8_t slice_data_anchor_frame_idx[256];
+      uint16_t slice_count;
    } slice_parameter;
 };