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-rw-r--r--guix/build/asdf-build-system.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/guix/build/asdf-build-system.scm b/guix/build/asdf-build-system.scm
index dd6373b33a..1be2b3c5f0 100644
--- a/guix/build/asdf-build-system.scm
+++ b/guix/build/asdf-build-system.scm
@@ -79,7 +79,7 @@ valid."
   (let ((source (getcwd))
         (target (source-directory out name))
         (system-path (string-append out %system-install-prefix)))
-    (copy-recursively source target)
+    (copy-recursively source target #:keep-mtime? #t)
     (mkdir-p system-path)
     (for-each
      (lambda (file)