diff --git a/test/blackbox-tests/test-cases/sendfile-large-file.t b/test/blackbox-tests/test-cases/sendfile-large-file.t
index ab6e766d628..c7b1cd860e2 100644
--- a/test/blackbox-tests/test-cases/sendfile-large-file.t
+++ b/test/blackbox-tests/test-cases/sendfile-large-file.t
@@ -17,6 +17,6 @@ We create a large file and check that it is copied completely.
   4294967299
 
   $ dune_cmd stat size _build/default/file.dat
-  3
+  4294967299
 
 (3 indicates that the file size is taken modulo 2**32)