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-rw-r--r--tests/substitute.scm3
1 files changed, 2 insertions, 1 deletions
diff --git a/tests/substitute.scm b/tests/substitute.scm
index 6560612c40..bd5b6305b0 100644
--- a/tests/substitute.scm
+++ b/tests/substitute.scm
@@ -47,7 +47,8 @@ it writes to GUIX-WARNING-PORT a messages that matches ERROR-RX."
   (test-equal name
     '(1 #t)
     (let ((error-output (open-output-string)))
-      (parameterize ((guix-warning-port error-output))
+      (parameterize ((current-error-port error-output)
+                     (guix-warning-port error-output))
         (catch 'quit
           (lambda ()
             exp