diff --git a/repos/os/include/block/request.h b/repos/os/include/block/request.h
index 1bb0e5e32c..66e95d1445 100644
--- a/repos/os/include/block/request.h
+++ b/repos/os/include/block/request.h
@@ -30,6 +30,7 @@ struct Block::Request
 	Genode::uint64_t  block_number;
 	Genode::uint64_t  offset;
 	Genode::uint32_t  count;
+	Genode::uint32_t  tag;
 
 	bool operation_defined() const
 	{
diff --git a/repos/os/include/block/request_stream.h b/repos/os/include/block/request_stream.h
index acd4ea8ecf..b9378df71c 100644
--- a/repos/os/include/block/request_stream.h
+++ b/repos/os/include/block/request_stream.h
@@ -196,7 +196,8 @@ class Block::Request_stream : Genode::Noncopyable
 				                  .success      = Request::Success::FALSE,
 				                  .block_number = (uint64_t)packet.block_number(),
 				                  .offset       = (uint64_t)packet.offset(),
-				                  .count        = (uint32_t)packet.block_count() };
+				                  .count        = (uint32_t)packet.block_count(),
+				                  .tag          = 0};
 
 				Response const response = packet_valid
 				                        ? fn(request)