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-rw-r--r--guix/build/gnu-build-system.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/guix/build/gnu-build-system.scm b/guix/build/gnu-build-system.scm
index 2c0f60c9ba..a39a884852 100644
--- a/guix/build/gnu-build-system.scm
+++ b/guix/build/gnu-build-system.scm
@@ -342,7 +342,7 @@ makefiles."
   (define (dump file)
     (let ((prefix (string-append "\n--- " file " ")))
       (display (if (< (string-length prefix) 78)
-                   (string-pad-right prefix 78 #\---)
+                   (string-pad-right prefix 78 #\-)
                    prefix)
                port)
       (display "\n\n" port)