1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/by-name/fu/fupdate-sys/fupdate-sys.sh b/pkgs/by-name/fu/fupdate-sys/fupdate-sys.sh
index 4ec3e9e8..57ced766 100755
--- a/pkgs/by-name/fu/fupdate-sys/fupdate-sys.sh
+++ b/pkgs/by-name/fu/fupdate-sys/fupdate-sys.sh
@@ -151,7 +151,7 @@ msg2 "Updating git repository..."
 git pull --rebase
 
 # We use a tempfile, to make this truly async.
-default_branch=$(mktemp)
+default_branch=$(mktemp -t fupdate_flake_XXXX)
 cleanup() {
     rm "$default_branch"
 }