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-rw-r--r--build-aux/hydra/gnu-system.scm4
-rw-r--r--build-aux/hydra/guix-modular.scm4
2 files changed, 4 insertions, 4 deletions
diff --git a/build-aux/hydra/gnu-system.scm b/build-aux/hydra/gnu-system.scm
index f54302cf63..4afdb48903 100644
--- a/build-aux/hydra/gnu-system.scm
+++ b/build-aux/hydra/gnu-system.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2020 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2017 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;; Copyright © 2018, 2019 Clément Lassieur <clement@lassieur.org>
 ;;;
@@ -31,7 +31,7 @@
 
 ;; XXX: Debugging hack: since `hydra-eval-guile-jobs' redirects the output
 ;; port to the bit bucket, let us write to the error port instead.
-(setvbuf (current-error-port) _IOLBF)
+(setvbuf (current-error-port) 'line)
 (set-current-output-port (current-error-port))
 
 (define (find-current-checkout arguments)
diff --git a/build-aux/hydra/guix-modular.scm b/build-aux/hydra/guix-modular.scm
index 9ff9e090fc..8e07e7cd01 100644
--- a/build-aux/hydra/guix-modular.scm
+++ b/build-aux/hydra/guix-modular.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2017, 2018 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2017, 2018, 2020 Ludovic Courtès <ludo@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -33,7 +33,7 @@
 
 ;; XXX: Debugging hack: since `hydra-eval-guile-jobs' redirects the output
 ;; port to the bit bucket, let us write to the error port instead.
-(setvbuf (current-error-port) _IOLBF)
+(setvbuf (current-error-port) 'line)
 (set-current-output-port (current-error-port))
 
 (define* (build-job store source version system)