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-rw-r--r--guix/derivations.scm1
1 files changed, 1 insertions, 0 deletions
diff --git a/guix/derivations.scm b/guix/derivations.scm
index 2cbf46f465..678550a39e 100644
--- a/guix/derivations.scm
+++ b/guix/derivations.scm
@@ -1095,6 +1095,7 @@ applied."
        (let ((mapping ',mapping))
          (for-each (lambda (input output)
                      (format #t "grafting '~a' -> '~a'...~%" input output)
+                     (force-output)
                      (rewrite-directory input output
                                         `((,input . ,output)
                                           ,@mapping)))