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-rwxr-xr-xguix/scripts/substitute.scm1
1 files changed, 1 insertions, 0 deletions
diff --git a/guix/scripts/substitute.scm b/guix/scripts/substitute.scm
index dd49cf15f3..61eff18869 100755
--- a/guix/scripts/substitute.scm
+++ b/guix/scripts/substitute.scm
@@ -959,6 +959,7 @@ DESTINATION as a nar file.  Verify the substitute against ACL."
                                       progress)))
       ;; Unpack the Nar at INPUT into DESTINATION.
       (restore-file input destination)
+      (close-port input)
 
       ;; Skip a line after what 'progress-proc' printed, and another one to
       ;; visually separate substitutions.