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-rwxr-xr-xscripts/install.in2
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/install.in b/scripts/install.in
index 0eaf25bb3..7d25f7bd7 100755
--- a/scripts/install.in
+++ b/scripts/install.in
@@ -60,7 +60,7 @@ case "$(uname -s).$(uname -m)" in
esac
# Use this command-line option to fetch the tarballs using nar-serve or Cachix
-if "${1:---tarball-url-prefix}"; then
+if [ "${1:-}" = "--tarball-url-prefix" ]; then
if [ -z "${2:-}" ]; then
oops "missing argument for --tarball-url-prefix"
fi