diff --git a/test/lisp/net/tramp-tests.el b/test/lisp/net/tramp-tests.el
index 57b67a0bfe..80939934e0 100644
--- a/test/lisp/net/tramp-tests.el
+++ b/test/lisp/net/tramp-tests.el
@@ -107,6 +107,7 @@ tramp-test-temporary-file-directory
 
 ;; This should happen on hydra only.
 (when (getenv "EMACS_HYDRA_CI")
+  (customize-set-variable 'tramp-chunksize 3072)
   (add-to-list 'tramp-remote-path 'tramp-own-remote-path))
 
 (defvar tramp--test-enabled-checked nil