diff --git a/src/internal/tpax_driver_impl.h b/src/internal/tpax_driver_impl.h
index 9860717..2aca3d1 100644
--- a/src/internal/tpax_driver_impl.h
+++ b/src/internal/tpax_driver_impl.h
@@ -83,6 +83,7 @@ struct tpax_driver_ctx_impl {
 	void *                        dirbuff;
 	void *                        bufaddr;
 	size_t                        bufsize;
+	size_t                        nqueued;
 	off_t                         cpos;
 };
 
@@ -225,6 +226,7 @@ static inline void tpax_set_driver_dirmark(const struct tpax_driver_ctx * dctx, 
 	struct tpax_driver_ctx_impl * ictx;
 	ictx = tpax_get_driver_ictx(dctx);
 	ictx->dirmark = dirent;
+	ictx->nqueued++;
 }
 
 static inline off_t tpax_get_unit_hpos(const struct tpax_unit_ctx * uctx)