diff --git a/libc/kernel/uapi/linux/incrementalfs.h b/libc/kernel/uapi/linux/incrementalfs.h
index 531760d..cfaee52 100644
--- a/libc/kernel/uapi/linux/incrementalfs.h
+++ b/libc/kernel/uapi/linux/incrementalfs.h
@@ -110,6 +110,7 @@
   __u32 start_index;
   __u32 end_index;
   __u32 total_blocks_out;
+  __u32 data_blocks_out;
   __u32 range_buffer_size_out;
   __u32 index_out;
 };