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-rw-r--r--guix/build/gnu-build-system.scm1
1 files changed, 1 insertions, 0 deletions
diff --git a/guix/build/gnu-build-system.scm b/guix/build/gnu-build-system.scm
index efee570292..3b139a99b8 100644
--- a/guix/build/gnu-build-system.scm
+++ b/guix/build/gnu-build-system.scm
@@ -242,6 +242,7 @@
   "Build from SOURCE to OUTPUTS, using INPUTS, and by running all of PHASES
 in order.  Return #t if all the PHASES succeeded, #f otherwise."
   (setvbuf (current-output-port) _IOLBF)
+  (setvbuf (current-error-port) _IOLBF)
 
   ;; The trick is to #:allow-other-keys everywhere, so that each procedure in
   ;; PHASES can pick the keyword arguments it's interested in.